#please look at elmonstro's art too like what the fuck

[glitchyalchemist]

A fic where Brainstorm has been uh...a bad fish?

honestly this was something I wrote on a whim for @elmonstro's art (NSFW) back then and I don't think I have the brain to finish it so I just cleaned it up a bit and here it is. probably too unfinished to be posted to ao3 so uh, enjoy secret tungle content?

collection: mermaid au - not canon for that au rating: nsfw cw: D/s vibes, sadomasochism

The subtle line of the plating seam was almost impossible to detect under his digit, and if he hadn't known that this was where the mermaid's modesty panels lied he would have never found them. But even the soft touch of brushing his finger tip up and down the seam was enough to have Brainstorm shivering in his hold, leaning harder back against his chest with his arms on either side of their forms gripping for a hold from the edge of the pool.

"Is this what you wanted?" Perceptor asked in a low voice right next to the mermaid's audial. "Is this why you've been swimming into me with enough force to knock me over? Because you wanted attention?" The low timbre of his voice was enough to have Brainstorm squirming even more, his field broadcasting fluster and arousal like he had been caught for some horribly embarrassing secret.

Which it probably felt like too, because the mermaid was never one to directly ask for what he wanted, instead dropping subtle and not so subtle hints whenever he wanted something that he was too embarrassed to ask for. Getting all huffy and pouty if Perceptor wasn't immediately picking up on his hints.

"Well, you've been ignoring me..." Brainstorm argued weakly.

"I was working. I can't always play with you," Perceptor said, but he didn't sound at all like he was genuinely scolding the mermaid, and more just teasing him for being so needy. Honestly he thought that it was adorable. Even the flush on Brainstorm's cheeks now was adorable, and the way his long frame was squirming in his hold was making him look good enough to be devoured.

Perceptor made the next downward brush of his thumb over the seam harder, more demanding.

"Well, aren't you going to open your panels? I can't help you if you don't let me in."

Brainstorm made a choked little sound, but right after the panels under his fingers were transforming away and Perceptor could press two of his fingers over the thin slit of wet mesh that was already starting to feel plush from arousal. He drew them gently through the thick lubricant, spreading it all the way up to Brainstorm's little node that was pulsing under his finger tips.

"There you go. Poor thing, have you been this turned on the whole time?" Perceptor asked as he rubbed slow circles over the slick pearl, and the mermaid was leaning even heavier into him as the sudden pleasure made him tense up with little shivers.

“Hha, I was trying to tell you,” Brainstorm gasped and tried to argue, but in exchange for his sass he only earned a pinch of his anterior node that had his optics fluttering shut and mouth falling open in a moan.

“No, you were trying to frustrate me,” Perceptor corrected him firmly, and the mermaid either couldn’t or wouldn’t even try to argue with him about it. Probably because he knew it to be the truth, or because Perceptor was gently tugging on his node before it slipped from between his slick fingers, and he returned to the slow circular motions again to soothe the sting on the poor abused thing.

“You were trying to get my attention in the only way you know apparently, by pushing and pulling me. But I’ve told you before that you need to use your words because I can’t read your mind,”

“I think we need to practice that some more. How to use your words to ask for things that you want. So tell me Brainstorm, what was it that you wanted from me?”

—

Brainstorm kept squirming in his hold, his sharp little claws digging into the back of Perceptor's palm which was holding his valve lips open. While the fingers of his other hand kept pumping into the mermaid's wet valve and drawing out those sweet little whines of his with every rough movement. But he had still not gotten the answer that he wanted, because Brainstorm was avoiding the question, probably hoping that Perceptor would be distracted by his cute and needy act.

Which wasn't an entirely wrong assumption since he had gotten a bit distracted and indulging, even when this was supposed to be an educational moment.

Perceptor drew his fingers out of the plush valve with a flick that had Brainstorm flinching with a gasp, and without the rough stimuli that had him squirming the mermaid was now hesitantly melting bonelessly against his chest again while trying to catch his breath. But with the fingers of his other hand that were still holding Brainstorm’s valve open with a firm V Perceptor could feel it pulsing needily under his touch, and see fresh and thick lubricant roll out from the abused canal with every push.

"So, what was it? What was it that you wanted from me, Brainstorm?" the mech asked in a tone that had the mermaid whining pitifully. A clear sign that he was close to breaking but still being difficult and shy, not quite ready to swallow his pride and just say it. He had a habit of avoiding having to be straightforward, but fortunately for him Perceptor knew how to make little brats find their words.

"Apparently not me fucking your cute valve with my fingers until you overload on them since you're not saying anything," Perceptor teased, and just to make it a bit harder for the mermaid he drew those fingers roughly over the wet mesh until he reached his sensitive node and pinched it briefly between two digits. Messing up whatever flustered reply Brainstorm had tried to prepare as it turned into another broken moan.

"So if you don't want me in your valve, how am I supposed to help with this then, hm?" Perceptor asked mockingly, withdrawing his other hand and spreading out the V of his fingers so Brainstorm's valve was in clear display now. And the mermaid was groaning as he looked down at the lewd mess of himself with half lidded optics, his face flushed from both arousal and embarrassment, his node twitching in a sign of how this turned him on.

"Am I supposed to believe that you would overload if I just touch you over it?" Perceptor asked and softly placed his free hand over the valve again, running all four of his digits over the lubricated lips as gently as he could in a loving pet. Brainstorm was responding so beautifully, his valve moving against his fingers, his pretty mouth pulled tightly shut to try and stiffe sounds as he was shaking his helm lightly in a no now. Which still was not the verbal answer Perceptor was looking for.

"I don’t know, maybe it could work. Perhaps I just need to touch harder." Perceptor then said, his voice dropping lower just before he brought his palm up and smacked it down in a light but sharp slap right over Brainstorm's node and wet lips.

The reaction was instantaneous as Brainstorm jolted from surprise with a little yelp, but there was nothing but an explosion of arousal and fluster in his EM field as he squirmed and tightened his grip on his lover’s hand and gasped his name. So with his little test bringing successful results, Perceptor brought his hand up and smacked it over his valve again, getting a very satisfying wet sound from the impact. But not as satisfying as the loud moan he pulled out of Brainstorm who flinched in his hold before he was bowing his back, his long tail curling up under the water before them in a clear sign of pleasure.

"Oh, was that it? Were you annoying me on purpose so I wouldn’t be too gentle with you? Does it feel better when it stings a little?" Perceptor mocked him harder, letting himself get excited at the mermaid's reaction to being roughed up like this.

"Phl-please. Percy~" Brainstorm moaned, and Perceptor could feel his whole valve twitching and pulsating against his hand, incredibly wet. And he couldn’t resist the urge to dig his two middle fingers deeper between the lips as he drew his hand gently up and down through the thick lubricant.

"Please what, Brainstorm?" Perceptor asked firmly, because no matter how much he wanted it as well he wouldn’t be indulging this time until Brainstorm gave him what he asked for.

And the mermaid’s tail flicked with agitation under the water’s surface with that flustered little trilling sound he sometimes made, but from his field you could spy that his resistance was cracking from the way of his neediness and arousal. He was finally nearing that edge where instead of attitude the mermaid started to slip into his polite voice because the want overpowered whatever embarrassment he had left in him.

"Please more," Brainstorm then pleaded so cutely, his hips trying to push into Perceptor’s palm as he leaned his chassis back and arched his back, resting his helmet on his shoulder. But Perceptor wasn’t allowing the pleasure. Not yet.

"More what? I want you to say it," he pressed firmly, because he knew that Brainstorm was ready to bow. And when he did it would be delicious.

The mermaid turned his helmet so he was hiding his face in the microscope’s neck, his breathing coming in fast and hot little gasps against his neck cables. And from the tight curl of his tail and the light tremble of his hands you could see how much it took from him to fight the urge to give in. How his field displayed clearly the hesitation of letting go of his embarrassment and control, and the incredible need to allow himself to just fall into Perceptor’s hold. Until he was hanging right on the edge, letting go of the last of his reservations as he spoke in a breathy and openly needy voice.

"Please do that again. Please, Percy. Slap it. It felt so good, please."

“Good boy.”

Satisfied enough with the answer Perceptor gave him exactly that, bringing his soaked hand up before he brought it back down in a sharp slap. And even when Brainstorm was still jolting and arching his back with a broken moan, Perceptor was already slapping his valve again, and again.

The sharp little claws of the mermaid’s hand were digging into his left one with every slap, his whole long frame twitching from the sensations as his cries and moans got only louder. And his EM field ebbed and flowed between pain and pleasure that were mixing together, his white helm trashing from side to side as if trying to say no even when everything else about him said yes.