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fallenasleepyetagain · 10 months

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Reveal - Nightmare/Blue Fic

Prompt: Secret Relationship (reveal)

Prompt from: @yearoftheotpevent

Media: Undertale AUs/UTMV

Genres: Romance (but in heavy air quotes), betrayal, dark fic (?), betrayal, human AU, idk what else lol

Characters: King Nightmare, Blue, Dream, Killer, Ink (mentioned), Error (mentioned), Horror (mentioned), Cross (mentioned)

Pairing: Nightmare/Blue

CW/TW - Manipulation, Implications of Abuse, Toxic behavior (?), mentions of violence, mentions of almost dying, being high mention, Nightmare being a piece of work

Other Notes: yes this is my second nightblue piece in like a month im ill for them sorry not sorry also a bittttt darker than i usually write? but i still think its ok also this is one of my most recent fics in it with a time/space jump! i hope its not too bothersome :0

Word Count: 4273 Words

The storm raged deep into the night, beating against the walls of the house, the wind screaming and howling as the rain poured down from the gray sky. It was perfect. The rain and thunder hid any sounds of Blue leaving and re-entering the house. Being out in the rain was cold, it soaked into his clothes and sunk into his skin. Drying off wouldn’t be an issue, and neither would sneaking back into the house after his excursion. At least, if things went his way. He wasn’t sure why he thought that this would be easy, it never was. Life enjoyed giving him what he wanted before sucker-punching him in the gut.

Getting back in the way he got back out was out of the question, climbing from the ground to the second story window that led into his room in this rain was unthinkable. Scaling up the wet bricks would surely lead to him crashing onto the back porch, and that would be a whole other issue. Teleporting was also out of the equation. To prevent intruders, they had set up a system to alert the three of them if any magic crossed the threshold of the house. Unfortunately, that included Blue.

There was a single light on in the house, and it belonged to the TV. Blue watched the channels change, someone trying to settle on one. He mentally swore over and over as he pressed himself against the front door, trying to hide from the rain. Why was he up right now?! It was three in the morning, he was never awake this early!

Rise and rest with the sun. That is how he functioned. Blue couldn’t remember a single time when Dream was awake in the middle of the night. And yet, there he was! At three in the morning! Watching TV!

Blue ran his hands up his face, the rainwater soaking into his skin, pushing his curly hair up. He could handle it being Ink. Ink would likely be stoned out of his mind, and if he wasn’t, he didn’t give a shit if Blue came home late, as suspicious as it was. The worst he would receive from Ink would be some teasing, borderline ridicule. But from Dream? Dream, someone who he respected more than anyone else, and someone who he would consider his best friend? Dream would ask. Interrogate. And he would have no choice but to tell the truth. Dream could read him like a book, and would see through his lies in an instance.

As the cold began to set in, he surrendered himself to the only option he had. He had wracked his brain for an alternative, some way to avoid the confrontation he knew he was about to have. There was always the option of waiting him out, but he wasn’t exactly jumping at the opportunity to spend more time in the cold rain. Maybe he could pull this off, somehow. Dream was likely very drowsy; Blue could tell by the way he half-heartedly switched through channels that he was forcing himself to stay awake. Why he was doing that, Blue couldn’t say. He hoped that it wasn’t because Dream noticed his disappearance.

With a cold and trembling hand, Blue opened the front door, pushing it open with his shoulder. He had to force it closed, the wind fighting him as he did so. As the door shut with a gentle click!, the TV paused. It was on some documentary that Blue doubted Dream was interested in. He didn’t move far into the house, allowing his clothing and hair to drip onto the mat by the front door. Dream twisted his body, facing Blue with only his face, his hips still facing the TV. It looked incredibly uncomfortable and Blue doubted he would stay in the position for long.

Due to the heavy rainstorms that have been happening in their world, the trio had been keeping towels next to the front door as of late. Using one of them, Blue managed to get most of the water out of his curls and clothes, although he would stay a little damp until he changed.

“Where were you, huh?” Despite the playful tone of Dream’s voice, Blue felt his heart leap into his throat. His heart slammed against his ribcage as he got rid of the water soaked into the scarf onto the towel. He slipped his scarf around his neck, feeling the texture on his face as he gathered his thoughts.

A lie was out of the question, Dream knew his tics.

However, maybe he didn’t have to lie. It wasn’t a lie if he didn’t give Dream all of the information, right?

“Oh, you know.” Blue spoke, flinging Dream’s playful tone back at him. He managed a slight smile, despite the anxiety bubbling in his stomach.

Dream chuckled. He finally decided that twisting his body at the waist was uncomfortable and sat up on the couch, arms resting on the upper couch cushions. He leaned into the palm of his hand, watching as Blue discarded his boots next to the shoe rack.

“I don’t, actually.” He dropped the smirk on his face in favor of something softer. “Indulge me?”

“Mmm…” Blue hummed, wringing out his gloves over the kitchen sink. He had flicked on the one light right above the sink and none else. It wasn’t necessary, as he knew the layout of the kitchen better than the back of his hand, and turning on more lights would awaken Ink, and that would be a whole other problem to deal with!

How much could he hide from Dream? Maybe skewing the truth would work just fine…

“I was with Cross.” Not exactly false.

Dream’s face dropped, which Blue expected. He turned back around on the couch, grumbling to himself. The mere mention of Cross should dissuade Dream from continuing the conversation entirely. Both Cross and Dream disliked each other greatly, but Blue could not figure out why. Their personalities clashed, sure, but Blue didn’t think it was to that high of a degree.

“And?”

“Huh?” “You were with,” Dream grit his teeth as he stood up, brushing off his black jeans before walking into the kitchen. “Cross, and? What did you do with him?”

Blue was still a little damp by the time Dream got over, but he didn’t mind. It would dry. As Dream walked over, he flicked off the light, leaving the two in darkness. The only light source was the TV, which was beginning to dim, and Dream’s golden eyes. Dream leaned against the counter, one hand on it, the other on his waist. His posture was casual, he wasn’t upset. At least, Blue hoped he wasn’t reading it wrong.

“...We were in a library.”

Blue hoped that the darkness would shield his nervous tics, shield Dream from his lies.

“Was this a planned meeting?”

“Yes.” Again, not a lie. Not fully.

The silence wrapped around his neck like a noose, leaving him breathless. He couldn’t read Dream’s face, both due to his incredible poker face and the darkness around them. He cocked his head to the side, thinking.

“You could’ve told me, y’know.”

Oh thank the heavens.

“I mean, I don’t like Cross, at all, but I respect your relationship with him. I’m not going to like, stop you from seeing him or anything.” Dream kept his arms crossed as he spoke, his body relaxed as he shrugged. “Buuut, I feel like you're hiding something. You’ve got this nervous energy around you, B. Did something happen?”

There it was. He should’ve known Dream would catch on eventually. It was hard to hide things from someone who could read your feelings. Blue sighed, the sound of his heart pounding in his head was clogging up his mind. He leaned against the counter by the sink, his hands gripping onto the countertop.

“You can tell me anything. Even if it has to do with Cross or whoever.”

Blue inhaled sharply, his resolve faltering. He got no pleasure from hiding and lying to Dream (or to anyone, for that matter). Maybe he could just be honest?

No, only a naïve fool would allow himself to think with such optimism.

“Why can’t a guy have his secrets?” It took all that Blue had to keep his voice stable, not allowing the anxiety to bubble over into his voice. If he could play defensive, and then change the subject, then he’d be able to get off scot free.

“Why can’t that guy tell his best friend his secrets?”

“Ah…” Blue glanced away, the smallest bit of anger pooling inside of him. Despite his inherent goodness, Dream was one to play underhanded, and pulling out the ‘best friend’ card was a cheap tactic! He ran his hand through his damp curls, pushing them off of his forehead. He kept his eyes on the floor as he ran his hand down the back of his head, his hand resting on the side of his neck. He flinched as his fingers pressed down on the tender spot on his neck, his face twisting as he shoved his hand back into his pants pocket.

“What was that?”

“What was what?”

“You jumped. Are you hurt, let me see.” Dream stepped closer, flicking on the sink light. Blue shrunk away, hiding in his scarf. His mind was whirling, he needed to get out of this, he needed to divert Dream’s attention. This was possibly the worst thing that could happen. He couldn’t believe he flinched like that! He knew it was there, the blemish was still warm, it stayed warm, even when the cold rain soaked into his skin.

“Dream, I…” He didn’t get the chance to finish as Dream pulled him back into the light, holding onto his forearms. Dream turned him to the right, allowing the light to hit the left side of his body. His nails dug into the palms of his hands as Dream shifted his scarf down his shoulder. Goosebumps appeared along his skin as Dream’s warm hand touched the side of his neck.

“What is…?” Dream murmured, getting closer to Blue, eyes squinted. “It’s not a bruise, is it?”

Reserving himself to the situation, Blue nodded, his voice barely audible. “No.”

“Then it’s…” Dream’s eyes widened and he pulled back, confusion and hurt dancing across all of his features. “Cross didn’t give you that, now did he?”

“Of course not.”

“So you lied.”

“Not exactly.” Blue strained, giving Dream distance, space. He messed with his scarf, having it cover his neck once more. “I was with Cross, and I was in a library.”

“Nightmare’s library.”

And there it was. The nail in the coffin.

“...Yes.” Blue said, his voice hoarse and throat dry.

All of Dream’s hurt became anger at the mention of Nightmare. Blue staggered further back, getting out of Dream’s way, out of his reach. He watched as Dream’s face contorted, his mind trying to wrap around his betrayal.

As much as he hated calling it that, there was no other word. His hand went up to his neck once more, slipping underneath his scarf. His fingers gently ran across the hickey, he had to make sure that it was really there.

“So, so lemme get this straight.” Blue could hear the hurt, the barely contained anger, in Dream’s voice. “You, knowingly, went to Nightmare’s castle, not just a meet up in another timeline, no, you purposefully went into the homebase of that bastard, and let him suck on your neck!”

Blue’s body stiffened, his shoulders going tense. “That…is what happened, yes.”

“Why?” Dream snapped, his hands balling into fists. Blue’s eyes widen at the sight of his fists, his heart slamming in his chest. Seeing this, Dream took a long, deep breath, and loosened his hands. He had never hurt Blue, but other people had. He didn’t blame Blue for his reaction. With a deep breath, he ran a hand through his hair, pushing his coils back. “I need you to tell me why you ran off to…to him of all people!

“Please. Let me understand. Make me understand why.”

“I…” Blue sighed, dropping his hands. “Okay.”

Dream kept his arms crossed, folded tightly over his chest as he gave Blue time to think. Time to get his thoughts in order. He shifted on his feet, heart slamming in his chest. He was about to admit everything. The prospect of that was…terrifying. He didn’t want to lose Dream as a friend, or lose him at all! At the same time, though, he didn’t want to stop speaking, or getting intimate with, Nightmare. Would he be forced to pick?

The more he thought about it, if he had to choose one or the other, he was beginning to realize that, maybe, his loyalties didn’t lie with Dream. A scary thought, considering he would have shot someone point-black with a blaster for Dream. When did this change? Where he would pick Nightmare over Dream?

“Do you remember the fight up in the mountains? The one where Ink and I evacuated an entire town from an avalanche?” “How could I forget?” Dream said, laughing a little. “I searched for days looking for you in the snow, only for it to turn out that Nightmare had taken you.”

“Yeah. That was the fight that, ah, started everything.”

“What do you mean? He took you prisoner, B.” Dream scowled as he spoke, concern rising in him. He knew about Blue’s relationship (if you could even call it that) with Error, the guy was too trusting. Too full of optimism. Believing that everyone could be a good person, if they just try. Horror dawned on him. Nightmare could, and would, use that.

“Not exactly. You see…I was trapped under the snow.” Blue took a deep breath. “It was scary, I could barely breathe, it was cold, and I couldn’t use my magic. I…I thought I wasn’t going to make it.”

“Oh, B…”

“But I did! Obviously,” Blue snorted. “It was Nightmare, actually, who fished me out. I don’t really remember what had happened, but when I woke up, I was in Nightmare’s castle.”

“The dungeon.” “No.”

“No?” Dream asked, an eyebrow rising.

“I was on a couch by a fireplace covered in blankets. And when I sat up…Nightmare was there.”

Blue half expected Dream to say something, but he was prompted to continue.

“I was scared, at first. I thought he was going to hurt me. He promised that he wouldn’t.”

“And you believed him.”

“I…” Blue flushed with embarrassment, “Yes. I did. And he didn’t! We just…talked. It was really nice, actually.”

“What.” Dream’s face flashed with a sense of hurt and anger once more, and Blue’s face fell in response.

“Dream, listen. I had never had a conversation like that before! It was like…like we clicked. I’ve never had such an intellectually stimulating conversation before!” Much to Dream’s alarm, Blue’s cheeks visibly warmed and his lips pulled themselves into a smile. “It was incredible!”

“Oh my God, you don’t see it.”

The smile dropped from Blue’s face, his arms going down to his side. “See what?”

“That he’s using you!” Dream hissed, anger filling him up once more. Anger at Nightmare, anger at Blue. “He’s using your trust to hurt me, to make you believe that you can trust him! He’s been fucking with you, and you fell for it!”

“That’s not…We’ve had our differences in the past but, I think that-”

“If by differences you mean tormenting you, then sure.”

“Dream-”

“But by all means, if you want to run off and be with him, I won’t stop you.” Dream gripped onto his forearms, teeth grinding together as he spoke. “I mean, I get it, really, he’s got the castle, the tentacles, the throne, the never ending cruelty. Didn’t realize that was your type.”

Blue could feel the venom being spit at him when Dream spoke. His heart slammed in his chest, and a familiar lump began to grow in his throat.

“Why are you so angry?” He croaked.

“Because you’re pissing me off! He’s obviously using you for ulterior means and the fact that you can’t see it, that you’re letting him mark you and who knows what else, makes me want to tear my hair out!”

Dream met eyes with Blue, and his body softened, just slightly, when he saw Blue’s wide eyes and pursed lips. He rubbed his forehead, nails still digging into his skin. “I can’t…I can’t deal with this, with you, right now. Just…go.”

“What?”

“Get out! I need some time to think. So go.”

“...Okay.” Blue whispered, voice trembling. Adrenaline pumped through his veins, forcing him to make a mad dash for the front door, his hands shaking as he opened the door. Outside, rain and thunder greeted him, but his legs forced him out, boots smacking against the buddy ground. Just when he was starting to get dry, the rain soaked him again, running down his face and making his clothes feel colder. He couldn’t tell if he was crying or not; rain and tears felt about the same. That was probably for the better.

Perhaps it was deranged of him to know who was at the door by how they knocked. However, it made his job a whole lot easier. Knowing who was coming in by the knock allowed him to have a few, sweet, seconds to prepare himself, to know how he should be presenting himself. With Cross, he would stand, if he wasn’t already, and take his position as Cross’s superior. There was no such thing as being too formal with Cross, it was informality that was the issue. For better or for worse, Cross felt more comfortable, or simply less anxious, if he knew who was in charge, and if that person made it clear. If he had to guess, this complex was likely his father’s doing. With Horror, on the other hand, being informal was the goal. He would often stay sitting down, being casual, and as open as he could be.

The rapping at the door told Nightmare that it was Killer who needed his presence. Killer knocked with his knuckles, brushing his hand against the door. There was no need to stand with Killer, although he would limit the informality. Killer was a wildcard, who knew how he would interpret certain things. Nightmare supposed that was somewhat his fault.

“You may enter.”

The door creaked open, and Killer slipped in like a shadow, barely making a sound. He stood at the door, as Nightmare had taught him to do, waiting. Nightmare finished his sentence, setting the quill down before gesturing to Killer to come with two fingers. He quickly read over what he had written in response before deeming it good enough before turning his attention towards Killer.

One of his legs was propped up, the ankle resting on the other knee. Nightmare leaned his face against the back of his hand, his teal eyes settling on Killer’s pure black ones.

“Whacha workin’ on?”

“Settling a land dispute. Nothing particularly interesting.” Contrary to popular belief, his title as King wasn’t just for show. He had a proper kingdom, and it was his job to make sure it stayed afloat. He may rule with an iron fist, but that didn’t mean that he didn’t care. “What do you want?”

“It's Blue.”

Ah, Blue. Nightmare hummed, smiling at the name. He was endearing, and kind. Despite his moments of incredibly handy naïveté, he was quite intelligent. Not the greatest conversationalist, but intriguing enough to forgive his struggle with small talk. He had to admit that he quite enjoyed the conversation the day he plucked Blue from the snow. If he had to be completely honest, it was a spur of the moment action. He didn’t want Blue to perish, not in such a fashion. Taking him home though, that wasn’t his plan. At least initially. It just so happened to work out that way, and it spurred on one of the schemes he had put on the backburner.

Earning Blue’s trust, his unwavering loyalty, and then ripping him from Dream’s hands.

“He’s at the front door, Boss.” “So soon?” Nightmare grinned, completely unsurprised. “Let him in. He knows the way.”

After all of their meetings, all of their erotic rendezvous, if Blue didn’t know his way to Nightmare’s bedroom by heart, then it would be a surprise.

It took a minute, maybe three, although Nightmare wasn’t paying attention, for Blue to come barreling into the room, damp with rainwater and his body trembling, likely for more reason than one. A towel was half-hazardly draped over his shoulders, likely given to him when he made his way up here.

“Back already? Did you miss me that much?” Nightmare grinned as he stood up, stretching his back a little as he did so.

“No- Well, I mean,” Blue chuckled, cheeks flushing. “Yes, I did, b-but that’s not why I’m here! I…”

Blue fidgeted with his hands, glancing away. “It’s Dream. He, um, found out.” Nightmare could feel the terror radiating off of him. It was as if Blue expected him to get angry, get aggressive. Not like this was unexpected, especially when they had spent so much time fighting against each other, when Nightmare spent so much time terrorizing him, feeding on his sweet, negative emotions.

“Found out what?” Nightmare asked, getting closer and gently holding Blue’s cold hands. He made a point to keep his voice low, his body language unthreatening.

“About you.”

“About us?”

“Mhm…” Nightmare gently wiped the tears forming in the corners of his eyes, using his other hand to feel his quick heartbeat via his wrists. “I’m really sorry.”

“It’s not your fault. I thought it was late in your universe?”

“I-It was! It was like three in the morning! I don’t know what in the world he was doing up!”

“And he…?”

“He saw the hickey and…he knows when I lie so I couldn’t…”

Nightmare gently held Blue’s face, his thumbs on the center of his cheeks. “I’m not mad.”

“Are you sure?”

“Of course.” Nightmare placed a kiss against his forehead, “I don’t care if he knows or not. The more time I have with you, the better.”

“You promise you’re not upset?” “Yes,” Nightmare chuckled, “I promise. Now, you’re a mess, why don’t you dry yourself off? You can borrow a shirt of mine, for now.”

Blue glanced towards the window, and it didn’t take a genius to know what he was thinking. Even though it was very early in the morning in the universe containing Dream’s house, the sun was peeking over the horizon on the eastern side of the castle. Sleeping now would set himself up on the path of becoming nocturnal.

“You can head to sleep.”

“But-!”

“Quiet. Allow your brain and body to rest.” Nightmare said, gently tapping Blue on his ass in the direction of his bathroom, causing him to squeak. “I’ll get you a shirt in the meantime, go get dry.”

With bright red cheeks, Blue skittered off to the en suite bathroom. Nightmare watched him go, eyes boring into the back of his head. Everything had panned out as planned. Not that he expected it not to, Dream was incredibly predictable and his reactions were perfect. Admittedly, he wasn’t completely sure if he would be able to wake Dream, as the guy slept like a corpse. It did work, and it went just as he intended it too.

All that was left now was to get Blue to stay in the castle with him permanently, which would be one of the easiest parts of his elaborate scheme. He could almost taste the despair Dream would feel, discovering that he had pushed Blue right into his loving embrace.

Choosing a shirt for him wasn’t difficult. They’d all look the same on him anyway: massive. He selected a black, satin, button-up shirt. He had slept in something similar in the past, and it had the added bonus of being a texture that Blue didn’t abhor, so he knew that Blue would be comfortable. He walked over to the bathroom door, opening it a crack before handing the shirt off.

“Thanks.”

“Of course.” Blue stepped out of the bathroom, his curly hair messy and frizzy from drying it with a towel. His scarf, which was decently dry, hung loosely around his neck. In his arms were his clothes, which Nightmare took from him when he bent down. “You look adorable.”

Blue pressed his face into his scarf, nodding. His legs were cold, but he wasn’t about to complain. “Th-Thanks.”

“I’ll go put your clothes in the dryer, you get into bed and sleep off your adrenaline and anxiety, you reek of it.”

“Right! Right, okay.” Blue walked over to the bed, pausing before getting into the plush, velvet covers. “Are you sure…?” He asked, gesturing with his thumb towards the window.

“It’s only six in the morning. I’ll come wake you up in a few hours.”

“Promise?”

“Yes.”

Nightmare walked over to the bed, holding the damp clothes in a tentacle. He pulled the covers over Blue’s shoulders, and leaned down, allowing their lips to meet. Blue smiled up at him, his big, blue eyes filled with nothing but genuine gratitude and adoration. He shifted onto his other side, back away from Nightmare. Nightmare smiled, smiled something sly, and borderline cruel as he gently tucked a piece of hair behind Blue’s ear. Everything had gone like clockwork, and he would reap the benefits for as long as he could.

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