I sacrificed my sleep for this...

Okay, so I'm back with more crappy writing! I just got into the MCU and OH MY LOKI IT'S THE BEST FANDOM TO EVER HAPPEN TO ME. I mean, I love TMNT but I really love this. I've always been a fan of Spider-Man and own two omnibuses of the comics, and then I saw Infinity War for the first time a few weeks ago (I know, I'm a year late) and completely fell in love. Then I saw Endgame and Homecoming. Screw me.

I refuse to accept Endgame.

So here's some fanfiction. I don't own anything. If I did, then everyone who's seen Endgame knows what would happen.

The headache had been building all day, and it had slowly turned into a migraine as Peter went upstate with Happy, to the Avengers complex.

Honestly, Peter was surprised he had made it through the school day. He had woken up with a dull throb in his temples but did his best to ignore it. It had only gotten worse as the day went on, and every sound was amplified, every light brighter. He knew what was happening, but didn't want to say anything. He couldn't worry his aunt or- god, no- Tony Stark.

But now, his heart was pounding in his ears and every beat caused his head to reel with the pain. He grit his teeth, not noticing the worried glances Happy kept sending his way. The driver would never admit it, but he was worried for the kid. Peter was usually a lot more talkative.

Peter let out a soft hiss through his teeth, burying his head in his hands. He couldn't just show up like this in front of Tony Stark, of all people. He might take back the suit, tell him he can't wear it if this keeps happening.

Logically, Peter should know that Tony wouldn't do that to him. But he was so far past thinking logically, all he could focus on is the building pain in his head. He couldn't even tell where it was coming from at this point, his whole brain just hurts.

When Happy stopped the car, Peter felt the jerk it makes in every bone of his body. When Happy said, "see you later, kid," it was all Peter could do not to flinch.

He grabbed his backpack from the seat next to him, slung it over his shoulder, and did his best to close the door quietly. The sound was like thunder, vibrating through his head and piercing his senses. Peter let out a soft whimper, walking into the complex.

"Hello, Peter, would you like me to take you to the lab?" FRIDAY asked, and it was like her voice was stabbing into his skull. He managed to nod, somehow, thankful that the elevator ride was smooth.

When the elevator stopped and Peter steps into the lab, the first thing he noticed was that the lights were blinding. "Hey, kid!" Tony greeted as Peter forced a smile onto his face.

"Hey, Mr. Stark," he replied, wincing at the sound of his own voice.

"Let's get to work, shall we?" Tony asked. "I guess you can make more web fluid, you said you've been running low?"

"Yeah," Peter said, not daring to ask Tony to talk a little quieter. He moved to his workstation, carefully mixing the chemicals he keeps under the desk. Tony goes back to messing with his Iron Man suit, doing who knows what.

Peter took some deep breaths, trying to calm the spinning mess that was his head. The lights were burning into his eyes, the noises rushing into his ears all at once, the smell of the chemicals creeping into his nose… It was too much. Everything was too much. He put his head on the desk, pressing his palms to his ears and closing his eyes tightly, trying to block it all out. Everything sense was coming at him so fast, he couldn't make sense of anything, everything was turned up to the very extreme. It was like the world was closing in on him.

The tears skidding down his face were burning hot and ice cold at the same time. He let out a whimper of pain, catching the attention of Tony. The billionaire turned at the noise, saw Peter, and rushed to the boy's side, putting his hand on his shoulder.

"Kid?"

The kid recoiled from his touch, flinching violently and pressing his hands tighter over his ears. Okay, touching and talking were clearly not good at the moment. Tony looked at Peter, hunched miserably over the desk, and whispered as softly as he could to him. "Kid, I'm going to get Bruce, okay?" Peter nodded, wincing at the noise again.

Tony also had FRIDAY turn the lights off, and saw Peter's stiff body relax a little at that, then went off to find Bruce. The other scientist was probably in his lab, Tony thought, running over as fast as he could.

"Tony, what's going on?" Bruce asked calmly as Tony rushed into the lab. Seeing the panicked look on his face, Bruce was instantly on edge. "Tony?"

"The kid," Tony said, "I don't know what's happening, but- oh god, he's up to eleven."

"Where is he?" Bruce asked, and Tony led him to his lab. The lights were still off and neither of them could see Peter.

"FRIDAY, lights at 5%," Tony whispered. Bruce was puzzled at this, but followed Tony's lead, talking quietly.

"Peter?" he said softly, looking towards Peter's workbench and sucked in a breath. Peter was on the floor, his hands still over his ears, eyes still screwed shut, but unconscious.

Tony was pacing outside of Peter's room when Natasha and Steve found him. "What's happening?" Steve asked, concerned. Tony was normally fairly unflappable, seemingly carefree, and to see him worrying like this… well, it worried the other two Avengers.

"Peter," Tony stated. "Something happened with him."

Steve and Natasha exchanged worried looks, and Clint threw the vent grating off, causing Steve to jump back a little as Clint jumped down.

"What?" Clint asked as Steve stared at him.

"What happened to Peter?" Natasha asked, completely unfazed by Clint's appearance.

"I have no idea," Tony said, running a hand through his hair just as Bruce stepped out.

"I think I know what happened," he said.

"What? What is it?" Tony said, sounding like a worried parent.

"I believe it was sensory overload," Bruce diagnosed, "based on what you told me. Sensitivity to light, sound, and touch. Plus, you mentioned something about dialed up to eleven, right?" Tony nodded. "He already has enhanced senses, and sensory overload is only worsened because of them. My guess is he passed out from the pain."

"What do we do?" Steve asked. "Just wait for him to wake up?"

Bruce sighed. "I think it's the only thing we can really do at this point."

"At least one of us should stay with him then," Natasha said.

"I can," Tony offered quickly, ignoring Clint's smirk.

"Tell me when he wakes up," Bruce said, glancing towards the doors worridley. "I left the lights off, his unconscious state is probably sensitive as well."

Tony nodded. Bruce, Steve, Clint, and Natasha all left him, Bruce casting him a worried glance as they left. Tony waved it off. He wasn't going to say it out loud, but he had come to care about Peter as a son.

"Ngh…" Peter groaned, rolling over. His head was pounding, aftereffects of a migraine. He squinted, trying to see through the darkness only to realize all the lights were off and the windows were blacked out. He heard someone stirring beside him and glanced over to the side of his bed.

"Hey, Underoos," Tony said gently. "You okay?"

"Yeah," Peter said, sitting up and wincing a little at the pain in his head. It wasn't nearly as bad as it had been before, but it was still lingering.

"Here," Tony said, handing him a glass of water. Peter eagerly drank it as Tony turned the lights on. Not all the way, about half.

"Thanks," Peter said.

"No problem, kid," Tony said, smiling. "FRIDAY, can you tell Bruce that Peter's awake?"

"Of course," FRIDAY responded.

"How are you feeling?" Tony asked, turning back to Peter.

"I'm okay, I guess. My head still hurts a little. I'm really sorry for freaking out on you, Mr. Stark," he said, sheepishly rubbing the back of his neck.

"Kid, you have no reason to apologize. You can't control it," Tony reassured him.

"Still, Mr. Stark, I'm-"

"I swear, if you apologize again-" Tony started, but was cut off by Bruce.

"Peter!" he said, rushing into the room. "I take it you're doing better?"

Peter nodded. "Yeah, thanks for helping me out."

Bruce laid a gentle hand on his shoulder. "It's no problem, Peter. Has this kind of thing happened before?" Peter hesitated a little. "Peter."

"Yes," Peter mumbled, looking down at the blanket.

"And you didn't say anything?" Peter shook his head. "Why?"

"I guess I was just embarrassed about it," Peter said. "And I didn't want you to know because I thought that you might think that I was weak."

"That wouldn't happen," Tony said. "I have panic attacks sometimes, does anyone think less of me because of that?"

"No," Peter said meekly. "Sorry for keeping it from you."

"Just tell us next time when it gets to be too much," Tony told him. Peter nodded.

"How long was I out?" he asked.

"About two hours," Bruce said. "Steve, Clint, and Natasha are pretty worried about you."

"I guess I should go tell them I'm okay then," Peter said, standing up. Bruce smiled at him.

"Yeah, I can go round them up. And we should probably tell the rest of the team so they know what to do in case this happens again," Bruce suggested.

"Yeah, that sounds good," Peter said and Bruce left, leaving Tony and Peter in the room together.

To his surprise, Tony wrapped Peter in a tight hug. "Don't scare me like that again, Underoos, okay?"

"Yeah," Peter said. "I'm sorry I didn't tell you earlier-"

"What did I say about apologizing for things you can't control?"

"Sorry…"

Yeah, don't be worried that I uploaded this at 5:20 in the morning. I didn't sleep, but I don't care. I want to make this into a one-shot series, so if you want a certain story, feel free to leave requests in the reviews or PM me! I'm very open to those.