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cardinalcanis · 8 days ago

Text

Compliance

*Comes out of a dark alley* "Hey kid, want some Titus smut to scramble that brain chemistry real good? I got your fix."

This is @cosmic-cryptid-from-beyond 's fault.

Summary: Titus was struggling with some unexpected side effects from the Rubicon Surgery, luckily he finds relief in unexpected hands.

Pairing: Demetrian Titus x NB!OC

Tw: smut, Adeptus Mechanicus, prostate massage, edging, genitals are a social construct, technically tentacles, Astartes have more holes than you think (trust me), MATH.

Word count: 7316

Tag squad (let me know if you wish to be tagged on stuff): @druidwolf21 @wolf-feathers12 @artemisareia @adhd-fandom-hyperfocus

@gallifreyianrosearkytiorsusan @kit-williams @egrets-not-regrets @jaghatai-khock @horuslupercal

@moodymisty @lemon-russ @thisuserislilsilly

@sinistermojo @beckyninja @justallll @ms--lobotomy @pluvio-tea

Mechanicus speech cheat sheet:

When the hyperfocus gets in my mind goes so hard into ideas it gets them pregnant. So as this has a lot of Math Symbols as I went hamm on writing the Tech Priest’s way of speaking. I’m not a mathematician, I played loosely with stuff and their meanings, do not scream at me. Here is a quick list:

> -> More than.

= -> equals.

! -> negation of, no

+++ -> increase.

<= -> less or equal to

& -> and

- - - -> decrease

T(statement) -> that statement or thing is always true.

=> -> therefore, implies, if… then

!= -> not equals to

∈ -> belongs to

⇔ -> if and only if, only.

\/ -> or

P(statement) -> probability of statement

Statement1 | statement2 -> statement1 happened because statement2 happened.

E(statement) -> the statement is an expected result.

∅ -> null

F(statement) -> that statement or thing is always false.

—----------------------------------------------------------------------------

Lieutenant Demetrian Titus of the Ultramarines, Liberator of Graia, slayer of Grimskull, veteran of the Deathwatch, bane of xenos, executioner of Thousand Sons… reduced to this pathetic drooling mess.

It had started around a month ago, the last bloody bug had been ripped to shreds but still he felt this hunger to keep going. He checked the state of his armor’s system, to his surprise the reserves of adrenaline shots hadn’t been used during the battle. Why did he still feel so restless? When did his bodyglove become so overstimulating? Had the material always been that noticeable on the skin when it was supposed to be seamless? Every single one of his nerve endings was screaming for touch, begging to be rubbed against something, ANYTHING. The worst was his aching groin, he had been close to believing that his codpiece was about to slingshot off him and get someone killed any second now.

“Testosterone > expected Astartes levels. Positive note. Risk factor = low. !(Possibility) of death.” had stated Magos Biologis Mu-Oragon, brown eyes scanning the dataslate.

“Low risk factor? I can’t barely focus on anything else Magos. What’s causing this?”

The mechanicus lifted their gaze from the datapad, pale skin bathed in its faint greenish glow. Titus couldn’t decipher if the person had been male or female before embracing the Omnissiah, but there was a graceful beauty on the mech priest that had been lacking on others of their kind… shit this is bad he’s now sexualizing one of those tin cans.

“This unit understands, patient’s +++frustration = expected. Rubicon <= a year.”

“Yes.” He had started to rock slightly on his seat, trying to focus on anything else rather than the heat coming from his core. At least his armor helped with masking the worst parts of his current condition, unlike the joke that tried to call itself a robe which he had to wear for examination.

“[(Rubicon <= a year)&(Testosterone > expected Astartes level)] = normal occurrence.” One of Mu’s mechadendrites reached for the shelf, pulling a heavy binder. They then held it open with the help of their four mechanical arms. “---Symptoms expected. T(Normal progression).”

“And what do you want me to do in the meantime! I thought the apothecary had referred me here for a solution.” he exclaimed out of frustration standing off the examination table. “Don’t you have any meds you can give me?”

His whole body shivered at the unexpected cold grasp from three mechadendrites pinning him back into a seating position. Blood flowed to his cheeks due to the surprising arousal that came from being manhandled by the seemingly meek Mu.

“Hormonal cycle must !(be) disturbed => not compliance. Compliance => possible late implant rejection. I !(compromise) unit Titus’ safety.” Mu-Oragon said in what was a wholeheartedly caring tone, even through the respirator’s distortion.

Titus had been told they had been the one in charge of his rubicon surgery, the one who saved his life. An incredibly dangerous procedure in normal conditions, but with the scale of his wounds it almost meant impossible success. Even with all that he didn’t imagine the Magos would feel protective of him, he was just another number in his surgery record anyways.

“Mu I can’t fight like this…” The same shiver again but now caused by the Magos’ grasp leaving him. Only the phantom feeling of the touch floating over his skin, another painful release he couldn’t attain, adding to the breaking down of his sanity.

“That statement is true. Hopeful contrast. !(medication) != !(relief).”

It took him a moment to wrap his head around the meaning of Mu’s words. He had become better at understanding the Magos after the repeated checkups on his condition following the rubicon surgery, yet there wasn’t a chance he could call himself fluent in mechanicus speech, less with someone’s accent as strong as the one in front of him.

“You can help then, is that what you mean?”

“Titus attempted stimulation for release = True?” they asked, pulling what seemed to be an informative pamphlet from the binder.

“You mean if I had tried jacking off?”

“That statement is true.”

A soft flush washed over Titus’ cheeks, glad the Magos’ examination room was empty today, Emperor only knows how hard this conversation would be in front of others. How could a room feel both so hot and cold at the same time? One of Mu’s mechadendrites tilted his head to drive his attention back towards the mechanicus, the touch has such softness uncharacteristic of what a machine would have. Yet the exception existed on Mu-Oragon, every single one of their four arms and many mechadendrites was designed for careful surgery where an eighth of a millimeter could prove life or death. He couldn’t recall all the instances during previous examinations when he had been touched by them and only noticed it once the contact became absent.

“Yes I have.” He answered, unfamiliar with the open disclosure of his intimate activities. “It hasn’t been working.”

“Elaboration on process required. Accurate solution given ⇔ accurate description of event.”

Mu-Oragon seemed to be deciding between a collection of pamphlets and booklets, skimming through them with the many prosthetic ocular lenses around his forehead while keeping their human eyes on Titus, which added to the multiple limbs, gave them quite an arachnid appearance.

“What do you want me to say? There is not much science to it…” Even though the theoretical was quite clear, for the first time since his neophyte years his mind found itself struggling to find a proper practical for it

Titus held Mu’s gaze, curiously the Magos Biologis had retained both of his human eyes, only attaching more ocular addons around. A thing the astartes found quite curious if compared to others of his kind, who preferred replacing the lesser biological counterparts first. Theoretical: Mu-Oragon retained their human eyes, practical: it was a conscious decision due to the more patient oriented side of their occupation, it helped to establish trust.

He found the practical fitting. Wide almond shaped eyes with a reassuring stare, a window to the candid individual living inside machine parts and shrouded in logic based statements.

Mu-Oragon’s mechadendrite surprised him again by resting part of its weight on Titus’ shoulder, comprehending the man’s struggle for words. He pondered on how much was Mu’s intent and how much was the limb’s machine spirit acting, he would have been lying if admitting that the relationship between mechadendrites and users wasn’t something he found interesting. One of his brothers, a tech-marine, had explained how they were beings of their own possessing an individual machine spirit; yet perfectly synchronized with his mind. Many times acting upon his thoughts without realizing.

“Following procedure occurs on common stimulation practice. True \/ false?” asked the Magos, extending a thin booklet towards him that read ‘Comprehensive guide to prostatic stimulation’.

“No” he answered as stoically as he could, looking at the object being handed to him.

“Inference: this unit’s previous statement = false.” chirped Mu, computer-like clicks emitted as they spoke, possibly running calculations. “Response to Titus’ current statement: compiled. Deeper stimulation > external. [+++P(relief) = P.relief (Release | deep stimulation)] > [+++P(relief) = P.relief (Release | external stimulation)]. E[(---surplus testosterone) \/ (∅surplus testosterone)]”

“You mean I can fix this by showing things up my ass?”

“Statement’s truthfulness cannot be validated. P[ ((---surplus testosterone) \/ (∅surplus testosterone)) | (Simple anal insertion) ] = not conclusive. Remark: Relief of ailment ⇔ proper technique = true.”

Titus swallowed a knot in this throat, followed by a long sigh. He didn’t expect the prescription for his ailment to be a masturbation technique.

“Doubts prostatic stimulation = E(relief)?” Asked Mu tilting their head to the side. “Inexperienced = true?”

Titus nodded, noticing how he had been holding Oragon’s gaze the whole time.

“I can provide asistance ⇔ (consent = True). (Perform on Titus & explain) ⇔ (consent = True)”

The booklet crunched a bit as he held it tighter, Mu had pulled him apart and back together before, likely there is no piece of him they haven’t touched… in the medical sense. Throne that simple though made him almost produce a low gasp. A different occurrence may have ended up in the rejection of such a proposal, but his situation was all but common. He could barely stay still without rubbing his aching crotch against something. Theoretical: this is just a medical procedure; practical: nothing else will come out of it.

“Alright Mu-Oragon.” He agreed in almost a whisper. “Just… please be careful.”

“T(Titus’ wellbeing is my priority.)” Even through the respirator their tone came out gleeful and reassuring.

A couple days after, back at his chambers, Titus gasped and struggled to achieve the previous results he had experienced with the Magos. He was following the same movements and booklet’s instructions to the letter, his fingers were bigger and thicker than Mu’s; still the efforts left him wanting. He had made himself cum, and it had felt good, yes. But his relief was a cup with a hole at the bottom, never filling.

Titus pressed his face against the drool covered pillow, recalling the memory from the examination room. Every time Mu had pressed their fingers inside him an asphyxiating wave of pleasure had drowned him over and over, his hairs stood with the remembrance of the Magos’ muffled exhalations due to the effort of manhandling such a heavier man. Another finger, he went deeper, a reminiscent thought of firm steel hands that had held his legs still; spread.

Mu had played him like the director of an astropathic choir does his organ. Has Titus been the only astartes with a similar issue they’ve had to help? He bit the pillow hard enough to cause a rip, there was anger. The thought of Mu-Oragon giving similar care to someone else brewed an overflowing pot of jealousy and rage in him. But why? It was the Magos Biologis’ job to aid the Astartes, it was obvious there was no emotional attachment to the action. Despite the evidence he couldn’t stop the reassuring and borderline loving statements they had directed at him during the procedure to eat at his mind. How comfortable they had made him feel in his vulnerability, how in the time of their exchange he had silently craved for Mu to touch more of his body, to touch theirs.

Titus sat in silence, frustrated tears sliding off his cheeks, a lone company in the otherwise relatively bare room. It was quite late at what the battle barge’s internal schedule had designated as ‘night time’, how much of a ‘night owl’ was the mechanicus? Was it proper to visit them? Were they busy? Were they saving another Astartes’ life? Were they soothing other Astartes’ post rubicon testosterone spike? Next thing Titus knew he was already dressed, one thought in mind. He should go to see them, by the primarch’s honor he had to see Mu.

He moved with haste, weaving through the crowd of servitors engrossed in periodic station maintenance under the watchful vigilance of Mu’s brethren. No, they couldn’t compare to the Magos, none of them. Shit, why did he cram the stupid booklet and lube he was provided into his pocket? It was too late to return, his body would have not allowed him.

Throne, those clothes were clean out of the dryer though they encountered themselves drenched with sweat. Titus’ walk to the desired wing was a blur, the fight between will and arousal occupied his focus in its entirety. Demetrian’s awareness returned to the front stage with his arrival at Mu’s laboratory, empty except for servitors. He pressed on past examination tables and towering shelves full of implements Titus had no idea of purpose, he didn’t need to anyways, he already had one.

“Mu…” he mouthed at a sound belonging to what could be Mu’s binharic speech.

The series of rhythmic computation sounds came out of a nearby room, the door almost fully closed. From the narrow opening left, aside from the overpowering smell proper of incense and machine oil, he could make sense that it was a private chamber.

There they were, sitting crosslegged on the floor, bathed in candle glow making their augments look like consecrated gold. Mu was perpendicular from the door, immersed in sacred meditation. In front of them a towering representation of the machine god crowned the extensive cogitator it was embedded on. The Magos’ hood was down, exposing their side shaved head, what was left of their brown hair in the middle presented tightly tied in a low ponytail. Cables came out of ports and cogitators on the sides of their head, neck and under their robes, connecting them to the one they were praying to. Two of their hands were in a prayer position, the other two resting on their knees. The many mechadendrites seemed deactivated, filling a circle around Mu as they laid over the carpet, like the resting wings of an angel.

He had opened the door a bit more, taking one step inside yet regretting it instantly. It felt wrong, he was a trespasser, disturbing a sacred intimate rite he didn’t belong at. Titus tried to turn back but a mechadendrite stood to life, clasping hand pointed at the marine as if it could see him. Mu’s eyes opened accompanied by a quick inhalation, reminding him of someone waking up from deep sleep.

“Unit Demetrian Titus…” surprise took over the Magos whose mechadendrites waved around them covering them until they could pull their hood back up. “Urgent assistance = true?”

The door rattled slightly as Titus’ hand trembled. Was he feeling fear? The feeling he was made immune of? Mu tilted their head, emitting a series of concerned clicks. They patted a space on the rug beside them, limbs pulling aside to make space for Titus.

“Permissions granted; accompany this unit. ⇔ desired so.”

He entered further, making sure that the door was closed behind him. The intensity of the incense only increased with his approach. Titus gave the machine god’s image a look, its aura swallowed him, he was allowed into the room but that didn’t mean he was welcomed, that it welcomed him.

“Detecting elevated blood pressure, presence of hyperhidrosis. Inference: condition disturbed.” They pointed out when he sat, the rest of their limbs focused on respectfully disconnecting the cables that joined Mu to the room’s cogitator. “Request: details needed.”

“Magos I… I have been doing everything as told.” The words were hard to come up with, this was a bad idea, he wanted to run. “Please, believe me.”

“Complicance.” they said in what could have been a sigh. “Hormoral reading required. !(time) for a blood scan, +++urgency.” With their words they took the disconnected end of one of the cables still attached to them. “Expedited read | (direct connection = true)”

A mechanendrite exposed the port at his nape. Even taking into account that the Magos’ intentions were clear and the connection into the ports around his body was a day to day affair; he couldn’t but instinctively want to lean away from the attempt. At least while conscious he had only been connected to external machines and his armor, making Titus and it become one. He was unsure of what linking to another conscious creature would be like.

“Mu wait… ah…”

He gasped at the connector’s insertion, a cold wave washed over him. Then, pressure. An extra force needed to be applied for the linkage’s proper attachment. Titus flinched when the plug was inserted to full length and secured. It has never felt this way, the imperceptive clicking shouldn’t be that all consuming, the effortless pressure shouldn’t send a shivering echo across his whole nervous system. The next breath came from lungs outside of his chest cavity. Parallel thoughts stood by his own. Connection state: stable. +++(blood oxygenation). Execute t01101000… wait what?

“Requests: stand still for reading.” Mu pleaded, their voice sounding closer than the separation between them suggested. “Current testosterone levels = previous reading. Insulin levels within Astartes range = true. Leptin levels within Astartes range = true. HGH levels within Astartes range = true…” they paused, Titus couldn’t see Mu’s throat but felt it on his own as it moved in a swallow. “+++(Oxytoxin levels)”

A mechadendrite slid its rigged tentacle down his back coming into a wrap around the waist. The Magos glared at it with burning disapproval hasting the limb to release him. Unbecoming = true.

“What is that? Is it wrong?” Titus asked, a pressing heat that wasn’t the one already overwhelming him joined the room.

“Oxytoxin = {social bonding hormone, love hormone, reproduction…}”

The command for Mu’s arm to disconnect from him was clear, Titus’ enhanced reflexes were faster, applying pressure on the Magos’ hand before it could pull the connector out. A heart that wasn’t his drummed frantically. P(mutual) = 80%. Could it be that they have also been feeling something similar? P(mutual) = 88%. For how long? P(mutual) = 90%...

Titus leaned forwards pressing his lips on Mu’s cheek right when it met with the respirator, the skin was so soft, their smell like the rest of the room = {iron, candle wax, incense, sweat}. Mu’s arms resisted the approach but the many mechadendrites welcomed him, they acted upon their master’s subconscious wishes.

“+++(levels) = {oxytocin, adrenaline, dopamine, vasopressin}.” They reported faintly. “Warning: Unit Titus breaching patient-magos protocol.”

“Are those hormonal readings yours or mine?” He asked with a tinge of humor, yet letting the wanting show.

“Irrelevant.” The Magos chirped with higher pitch than normal before more mechadendrites started rubbing themselves around Titus like purring cats, then stopping when Mu directed a stern echoing mental order.

“How long?” he asked, pressing his body against those appendages, begging for their touch.

“Comprehension | (Unit Titus’ attention = true)” Oragon’s voice barely rose over the rushed clicking of their cogitators. “P(rubicon primaris success | healthy Astartes) = 61.6%. E(rubicon primaris success | medically dead Astartes) = ∅.” Was it a memory that flashed before him? Anger, defiance, approval, tension, relief. “Demetrian Titus: Omnissiah’s miracle. T(Demetrian Titus is my biggest pride).” Mu pressed their forehead against his. “T(Demetrian Titus is this unit’s most beautiful creation). Possessive desire = true.”

He tried to get even closer, mind screaming to the magos’ to take him theirs as their right was. A slight passing migraine struck him, pushback.

“I want ∈ Titus. I want Titus ∈ me.”

They paused, a constant stream of data rushed from them to Titus. Failure = true. Unfaithful = true. Weak = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. 01001000 01100101 01110010 01100101 01110100 01100101 01101011 00100000 00111101 00100000 01110100 01110010 01110101 01100101. 01001000 01100101 01110010 01100101 01110100 01100101 01101011 00100000 00111101 00100000 01110100 01110010 01110101 01100101 01001000 01100101 01110010 01100101 01110100 01100101 01101011 00100000 00111101 00100000 01110100 01110010 01110101 01100101.

“I’m here Mu, make me yours.” Titus purred, pressing his face on the Magos’ neck, their scent ordering his body into a surrender. +++(serotonin levels).

“I want to execute statement compliance. Intervention. This unit !(execute) statement compliance. Mu !∈ Titus. Titus !∈ Mu. Mu ∈ The Omnissiah. Titus ∈ The Emperor.” With the great effort of several limbs they were capable of pushing Titus away, his whimper had a twin companion. “ F[P(I ∈ (Omnissiah & Titus) & Titus ∈ (Me & Emperor)) > 0]. Titus’ understanding = true?”

“Mu, being with you will not make me stop fighting for the Emperor nor will distance you from the Machine God.” Unit Titus’ statement = True. “It will only make me fight harder, to fight for the Emperor is to fight for humanity, you are part of humanity, you are part of what I fight for; what I will die for.”

Two of the Magos’ hands cradled his face, thumbs rubbing his cheeks, their eyes gifted him a loving painting colored in sorrow ahead of closing them tightly. Mu’s bodily cogitators’ clicking became louder, similar to a tired engine pushing itself up a difficult hill. Every single one of the mechanicus’ limbs trembled and rattled. Titus felt a piercing pain forming behind a skull that wasn’t his own.

“Magos stop that! You are hurting yourse…”

“I would hurt myself everyday if it means I do not hurt you Titus.” The lack of machine logic in Mu-Oragon’s statement caught him by surprise, that’s what they were doing, they were ending any process that would distort the message. To the extent of their modification, it hurt. “Attention =... Listen to me closely please. What’s in your mind, what’s in my mind; it is a chimera Titus. Fantasy. !(logical).” continued as their registry jumped between two conflicting voice modulations. “I will never be able to fulfill your requirements for intimacy. Demand: compliance with silence = true… I am inside your head right now. You have expectations and desires that I cannot match.” Mu opened their eyes, they looked watery and puffy. The clicking sound became more urgent, the cogitators were screaming for it to end. “Body parts you crave that Mu… I… do not possess. Blessed Cogitators Titus, look how hard it is for me to express myself in your language, do you think a relationship will work? T(I have no place in your world).”

The hastened clicking relaxed, lungs that weren’t his struggled for air. Mu gave in and placed their forehead on Titus’ chest. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. They purred in the comfort they shouldn’t allow themselves to have. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. They were surrounded by strong arms whose warmth they had no business craving. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Their face, implants included, being covered in kisses that had a better use on someone else. Yet they didn’t want someone else to have. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true. Heretek = true.

“You are no heretek” Titus spoke clearly, his voice making a body that wasn’t his own yet felt like it; to tremble. “I never asked you to change for me. I will not allow you to change for me. Whatever you bring to me will make me happy, because it’s yours.”

“Counterargument. Titus feeling this way | (+++testosterone & +++oxytocin). (Hormonal stabilization = true) => Titus !(love) Mu. E(Desire = {∅}).”

“Theorerical: the result of your reasoning is false. Practical: you are in my head, you must only look.”

“Compliance.”

There was an invasive tingle poking at his brain, searching, inquiring. They shared a long moment of silence, lullabied by cogitators and Mu’s binharic musings. It felt strangely intimate, not the idea he had in mind when he came out of his room desperate to have the Priest inside him. Yet he still ached for it.

Mu looked up to him. Pulling their hood down then guiding Titus hands on how to properly hold their face without disturbing the cablework. Throne, they were so strangely beautiful.

“This unit’s compliance: approval pending.” They said, “This unit’s compliance ⇔ (Titus’ trust = true & Titus’ consent = true).”

“You pulled my body apart and back Magos, do you really need more trust?”

“Mu-Oragon !(had) Titus’ consent for rubicon. Patient previous state = unconscious. Unconsciousness !(match) consent protocol. Repeating inquiry: Titus’ Trust = True?”

“Yes Mu I trust you.”

“Titus’ statement = true?” The Magos pressed.

“With my life, Mu please just… ah…”

Another cable made its insertion into Titus, now at a port on his lower back. His vision blurred for a second after the push that made the connection click, he felt himself holding Mu’s face and Mu’s face being held by his hands. A series of satisfied binharic purrs came out of him… the Magos. A touch, a gentle hand caressing behind his earlobe and going down the jawline made him moan quite loud. Titus tightened his lips afterwards full of confusion and shame. Mu chuckled behind the respirator.

“Proud remark: Any mortal knowledge of Titus’ body < this unit’s knowledge of Titus’ body.” Both him and them gasped in unison with the many limbs holding him in place. “Proceeding with statement validation.”

Fingers brushed his hair back in a soothing motion, just like they did that day at the examination room to calm his nerves.

“Retrieving previously used data; Titus = {good, strong, capable, beautiful}.”

With every word a new limb joined the embrace. Hands, ribbed tentacles, mechadendrite claspers; they all rubbed and massaged Titus’ body over his clothes. Pleasurable yet with the Magos’ teasing, no contact was made with any greater erogenous zone. The Marine played against the scheme, moving himself in a way Mu would at least grace the most vocal centers about their hunger, the mechanicus fought back trying to anticipate Titus’ moves and not let him have a win. They both were absorbed by childish chuckle and sporadic gasps. Mu’s binharic clicks were cheerful, jovial notes, light and dark compared with the ones from earlier.

He placed his lips on Mu’s neck, also feeling them on his. And ran kisses over both flesh and blessed metal parts. They tensed a bit when he attempted to touch their chest, Titus sensed a third heart rate increasing followed by a mental note reassuring him it was fine. Without leaving carefulness behind he went down the Magos’ neck, wrapping, what the jealous tentacle allowed, of an arm behind Mu’s thighs lifting their body enough for him not bend on a weird angle to keep kissing down, his lips making out of fleshy and non biological parts under the robe.

That was when the mechadendrites started to infiltrate the openings on his clothes and slide under. The metal was no longer cold as it had been warmed up by Titus’ own body heat. Had that been the Magos’ plan?

They both moaned at the sensation of ribbed well oiled tentacles rubbing themselves against Titus’ nipples, lower abdomen and inner thighs. The Marine was sitting on his knees, holding Mu with one arm and kissing their upper robed body, the other hand kept making sense of the shapes hidden by red cloth.

Anchoring themselves firmly on Titus’ shoulders with two of their arms, Mu used the leftover free hands to undo the ribbons, clasps and buttons keeping the robe on. They stopped, only them letting go would uncover their body. He eyed them expectantly, noticing how shades of pink bloomed on what could be seen on their cheeks.

“Witness the miracle of machine and flesh ⇔ (Units > initiates). Exception logged: Demetrian Titus.” Their voice sounded even more distorted than usual, nervous binharic chirps made interference with their words.

“You don’t need to undress more if you are not comfortable, Mu.” Titus indicated lovingly as he massaged one of their shoulders.

The grill covering Mu’s mouth didn't impede him from noticing they were smiling, the expression brightening their whole face. Adoring notes in binharic were said yet nothing in a manner Titus could understand, but he thought how it reminded him about how their prayers sounded like. With ritual reverence they let the cloth go, causing the scarlet to part and barely hang off their shoulders. He felt Mu shiver as that skin didn’t seem used to being uncovered, it was paler than their face and very thin, so much he felt afraid of his calloused palms breaking it open. Said skin was bitten into by metal, flexible pipes and transparent wiring transporting blood. Just as they did with their head Mu guided Titus’ hands across their upper body, reaching the pant's edge, a scar continuing down into the pubis was seducing him to follow it underneath. He would have if he hadn’t noticed how in certain places clusters of purple broke paleness’ ruling, matching where he may have innocently grabbed or kissed too excitedly.

“I’m sorry, I wasn’t aware you were that sensible.”

Titus got his mouth close enough to a bruise yet stopped leaving the lips hovering over it, only his breath making contact. He looked up to meet Mu’s gaze, a request for permission written on his. They tightened any grip on Titus leading to a shift of their weight forwards, pressing themselves against his lips. This time he could appreciate how the binharic purrs and notes actually started somewhere between their ribs and echoed towards the grilled respirator in their face to finish being properly enunciated. The pale layer vibrated and contracted with every joint moan, gasp, huff.

Mu took hold of another cable connected to them that had an orphan end with no port to call home. Instead of going for it right away they let the cord slide over Titus’ chest, going behind him by the left side of his neck and coming out from the right. The cables had a different texture from the appendages holding the mechadendrites, he enjoyed the contrast between stiff ribbedness and flexible softness. The port on the right side of his neck, by the joining with the shoulder, seemed to be the desired spot. The very moment the plug’s tip was to get inserted into it; Titus moved minimally away with a mischievous grin. Playfulness was older than machines, Mu wasn’t the only one with teasing rights.

Both continued the jolly game for a couple minutes; shifting, giggling. By the end, it seemed Titus would finally accept the insertion only for the marine to get Mu’s hand holding the cable with a light-hearted bite, not exerting a tinge of actual pressure. The Magos hummed then all together, their mechadendrites compressed his body right over spots he would feel their sting the most, the appendages close to his thighs pulled them firmly; forcing him to a more open and exposed sitting position. At the same time, Mu’s free hand seized as much as Titus’ hair it could and yanked his head back with surprising command; displaying the working area. All of it teared out a pained moan out his core.

“Delivering request for stillness.” They said, the teasing switched its tone from light-hearted into a lascivious one. “Patient Demetrian Titus !(compliance) => Execute: unit’s protocol for unruly patient subjugation. Titus != {bad patient}. (Titus = {Good patient}) = True?”

“Apologies Magos, I do want to be a good patient, please show me how.”

“Compliance.”

His heightened sensitivity perceived the contact between port and connector in ways words could barely describe. When the tip of the connector touched the outer ring, for half a second he could swear that the candles and lumens seemed to brighten then dull back to their normal luminosity. The friction of smooth metal against smooth metal from the middle of the insertion sparked ripples in his brain that reminded Titus just like a vox signal trying to connect. A final push brought the connection to properly click inside, if before it rippled across the nervous system; now there was no system left unassaulted by a powerful spasm.

Demetrian Titus went blank, only remembering short snippets drunk in this unadulterated euphoria, perception shifting quickly between bodies. Once his faculties adapted to the input stream he discovered himself in the same position but things had changed a little. Titus’ top was gone and his pants were down to the knees. Coagulated crimson lines decorated him all over, evidence from scratches his healing factor closed immediately. The marine was rocking his hips at the rhythm of one of the mechadendrites crossing between his legs, rubbing its oiled shaft over the crotch and between the buttocks. He was still holding onto Mu, quite closely. The Magos’ thighs were at both sides of his neck, Demetrian finding his teeth pulling at their pants’ waist band. Two of their hands were finding support from Titus' biceps, the other two grasping at the marine’s hair for dear life; robe barely hanging by their elbows. He saw no reason to stop it there.

Firmly holding Mu’s waist with one hand he lifted them up a bit, then using the other to grip the waistband at the back Titus slid their pants down, pulling them fully away. His lips' curiosity could finally scout the track indicated by that scar on their lower stomach. His kisses, the wetness of his tongue, the texture of his shaved cheeks; all sensations were mirrored back onto his skin. Then he made an interesting discovery, when he began charting what was left or lacked on Mu’s crotch it also reflected on his cock with curious representations. A lick on the front was actually felt at the base of his shaft, yet going and kissing a bit to the right from there was experience at the top of his glans. Mu’s moans were his moans, deep, hungry. Their connection was a cyclical loop of pleasure, what was felt on them echoed onto Titus then back into them. He wondered if the mechanicus was capable of feeling arousal from stimulation on that area without a two way connection. Maybe he could try to investigate in the future, as the now had Titus quite busy.

Mu moved the anchor points from Titus’ biceps to his hands, a metallic finger pried his mouth wide open making sure the tongue was fully out, then lifting themselves up they started to fully ride the Astartes’ mouth at the same rhythm the mechadendrite grinded its length between Titus’ legs. Their speech reduced to huffs and frantic binharic notes weaving the tunes of their shared pleasure. Titus almost dropped Mu when both of them were run over on climax’s path. Trembling prosthetic legs’ embrace became stronger, pressing him firmly on his face, a mortal with not as good breathing capacity would have likely perished out of air.

They shifted their weight around Titus to climb off his shoulders, sitting on one arm holding them, they pressed their face onto Titus’. That was when he perceived the respirator being slid down, thin soft lips and skin like the one on their other covered areas nuzzled him. Lungs that weren’t his momentarily ached as they readapted to unfiltered air. Mu’s kiss was shy, sloppy, and inexperienced. Their knowledge of other people’s bodies didn’t transfer well to the skill of kissing, it was fine, not like Titus had much either. They could learn together.

He pulled back from the kiss, not for lack of wanting but the realization he could finally admire Mu’s full face. It was round with big cheeks that were artificially parted with a depression between the cheekbone and cheek caused by the long respirator use.

“Isn’t it dangerous to take it off?” He asked quite concerned.

“!(Every unit).” their unaltered voice was more melodious than when muffled behind the respirator. “Mu-Oragon = {sacred binharic, chemical filtration}. Lung condition: stable. !(Risk)” They kissed him again then moved down his neck, he had forgotten, now they were connected Titus’ unquenching lust was also theirs. “Request: taste Titus.”

“You know the answer.” he smiled back.

Hums kept emanating from the respirator but without Mu’s mouth to guide them there was no binharic aria, just airy vibrations. He was fine without the tunes, that mouth looked beautiful with their fleshy lips crowning his nipple, disappearing into the bountiful hairy mass of his chest. Cold, a hand stroked up and down his shaft being unable to fully wrap its fingers around it. And Mu’s mouth, it was already small, yet his cock made it look even smaller by comparison, it made the whole Magos smaller by comparison.

They licked the leftover cum around the tip and down the shaft, maybe now discovering the taste he’ll have an enlightening comeback when Chairon jokingly tells him to go eat his own dick again.

Titus buckled and moaned not by stimulation itself but a memory, one of Mu’s hands was running its fingers in circles around the entrance to Titus’ backside. They were slippery, quite well lubricated in fact.

“Titus = {so good patient, follows prescription well}.” Mu teased him.

A grasping mechadendrite lifted up, holding the opened lube bottle he had stuffed inside his pocket before. Mu’s fingers barely peeked at the entrance, stretching the aroused fleshy ring.

“Titus’ memories: seen. This Unit's touch: requested. Compliance.”

They slipped inside with the same effortless precision as before, the joy of getting filled as he had been craving was unmeasurable. Titus grabbed Mu’s head and trusted his cock inside the Magos’ mouth, barely getting a third in. In vengeance they got another finger into him, he wailed at the stretch and pressure curling inside him. If before Mu played him like an instrument, the current Titus was the whole orchestra, from groans to wines they composed a melody out of the Astartes’ desire.

The rhythm became even faster, building a time bomb of pleasure inside his crotch. Drool and precum dripped down Mu’s chin, Emperor, Omnissiah, whoever was responsible: what a beautiful creature they were. Lustful indulgence was ramping up into a crescendo, Titus was getting close to relief he wanted to cry; and he did once Oragon stopped right at the plunge’s edge, denying him.

Titus was about to ask why when they held his buttcheeks open for the lubed thin rounded head of a grasping mechadendrite pressed into him.

“Wait!” He howled.

“Titus trust = true.” They whispered hugging the Astartes between their arms, and his cock between their thighs.

Bastard, they had made it so aiding his throwing member would mean thrusting back and sodomizing himself into them. He had no choice and soon realized how Mu didn’t oversell themselves when they said they knew Titus’ body best, his hole was so well prepared it took the claw and following tentacle quite well. The stretch was so much yet it didn’t feel painful, Golden Throne, it felt like something he didn’t know he wanted but now will never be able to live without.

Now the mouths of both of them were free he could appreciate how much of a mirror they had become, Titus was the baritone to Mu’s tenor-soprano, singing the same song in parallel harmonies. It was so much, he began bending over until he had the Magos pinned on the floor under him as he thrusted between their thighs, and the Magos had him entangled in many arms and cables as they stretched his insides.

Titus had been shivering when he approached the same edge of the cliff as before, it being at a higher distance from the ground compared to the last. The Astartes felt as if the fall was going to make him blackout again, Mu had given him so many gifts, brought back to life and now another way to perceive life through the skin of the one he cherished, their skin.

The timer on the time bomb in his crotch reached zero, a wave of pleasure after the other washed over him, he suddenly became aware of every pore in their skins, every hair on their heads. But it kept on, every single one of Mu’s appendages grabbed onto Titus as if letting go would cost them their life. He squirmed as his asshole didn’t see mercy nor rest, words were not able to be had with a throat so busy on pained moans.

Wait, did he have so many cables inserted? Titus finally became aware that more than three ports on his body were in use, when did it happen? When he went blank? Realization dawned on him: he was trapped. All this time he had been a careless fly dancing around the spider’s net, every step entangling him more and more until he was fully helpless, ready to be consumed. The moans transformed into howls, those became wails, wails into whimpers, whimpering devolved into sobbing, culminating in the drained gasps of a fuck hole that knows its place. His mind gave up to the pleasure finally breaking and going blank.

He woke to the smell of incense and the realization of being so literally empty, laying on his side with Mu facing him. Mechadendrites and cables were still holding him, not with hunger but care.

“I guess I ruined your rug.” He joked.

“!(underestimate) martian chemical cleaner.” The Magos smiled sleepily at him, they hadn’t put the respirator back on yet, purplish red bite marks and bruising dressed their lips and lower jaw, Titus rubbed a finger over those.

“My doing again I suppose, guess even my bare minimum of gentleness is still too rough. I’m sorry Mu, I didn’t want to hurt you.”

“Reasurance. Preemptive awareness = True. Exchange | risk assessed. Titus design = {Strong, powerful, deadly}. (System’s status: fully operational) => no need to disable recurrence of interactions.” they said, soothing his worries.

Mu’s voice returned to the metallic distortion as they put the respirator back on, gentle binharic hum seemed to communicate the Magos’ bliss on that moment more than any words they nor Titus could spare.

Then the song changed to a familiar prayer, Mu started to go over the cables connecting them to Titus in reverse, from the last to be connected to the first. Before each of the disconnections the prayers sang a layered stanza Titus attributed meaning due to the tune; gratitude, mourning, hope. One by one he saw himself dividing from Mu’s senses, his mind grasping at any pieces left of that consciousness which melted into his, a cry of loneliness as what as one was became two separate beings again. He didn’t feel gloom though, as the prayer implied, separation only meant a new opportunity to meet again.

“Wait a moment.” Titus interrupted when Mu-Oragon got to the final plug that was the first, the one at his nape.

“Attention = True. Unit Titus wellbeing: stable?” They asked with the leftover sleepiness of someone coming out of a deep trance.

“Titus ∈ to Mu, and = true - and that will always be true.” He spoke slowly, doing his best to speak on their lingo, knowing they may be doing a horrible job with laughable pronunciation. “Do Mu ∈ to Titus - this is a question.”

At least his hope of not saying anything offensive by accident was reassured. The mechanicus’ face became as red as the clean parts of the rug they were laying over, nervous binharic notes escaped them like an open faucet.

“Theoretical” they started, earning an instant chuckle from Titus. “Mu ∈ Titus. Practical: T(Mu ∈ Titus).”

Just as it all started Titus kissed them on the cheek, right over where the skin met the respirator. Weird, Mu was rubbing the back of his neck, plug gone yet he didn’t feel a disconnection. Maybe the Omnissiah had finally made up their mind about him.

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