Archive of Our Own ^beta

First thing Kirishima does in Bakugou's body is grab his pecs, "I thought they'd be heavier."

The first thing Bakugou does in Kirishima's body is punch something, "This is amazing. Why didn't you tell me you were this strong?"

The wall is in a million billion pieces on the ground. That's not where walls go. Now he's gotta see all the things he can lift. Bakugou lifts everything. It's practically weightless to him.

Kirishima said, "You knew that, bro."

"Yeah, but it's different when you feel it. Do you snort protein powder or something?"

"You haven't seen anything yet. Harden!" Kirishima holds up his hand, "How do I spark this up?"

Bakugou hardens. Feeling his skin become stone. He understands why Kirishima is so carefree. Nothing could touch him like this.

"Tap into your unbridled rage." Bakugou instructed.

"My unbridled rage?" Kirishima scrunchies up his face, "girrrr."

Seeing his own face like this was comical, but Bakugou could not stand for any of the extras seeing this.

"Real rage!"

Kirishima looks more constipated than angry.

"What makes you angry?"

Kirishima tries to think of things that make him angry, "Umm, lots of things like villains. Why are they so villain-y?! Well, sometimes it's economic issues that lead someone down the road of crime..."

"Focus on that anger."

"Economics!" Kirishima shouts. Tiny little pops spark from his hand.

"Good. Now angrier!"

"Did you see that!" Kirishima waves his hands in the air, "I made it explo-

Boom.

"I did another one!" Kirishima was so happy.

Boom. Boom.

"And another!" Kirishima realized, "You don't have to use rage, you can focus on the happy."

"Rage makes me happy."

"You're so manly."

Pop. Pop. Pop.

"Happy to see me or somethin'?"

Throwing his big stupid crush to the side, Kirishima said, "Harden now!"

Boom.

Luckily Bakugou already mastered his quirk, or his little diversion would have been dangerous.

"I didn't feel that at all."

"Cool right?" Kirishima smiled. It was a weird expression on Bakugou's face. Only Kirishima could give him a smile like that.

"Yeah." Bakugou joined in, "Do it again."

To onlookers nothing has changed. Just two idiots, an unstoppable force and an unmovable object beating the tar out of each other. Smiling and laughing.

To the pair, everything has changed. They gained a deeper appreciation for the other fighting a mile in the other's shoe. Bakugou learned what it was like to be a walking tank. Kirishima learned what it was like to be a glass cannon.

The next thing they did was lunch. Mornings full of violence really make you hungry. They chose wings. It was spicy enough for Bakugou. And meaty enough for Kirishima.

"How the fuck do you walk with these long ass legs?" Bakugou found a new way to complain about Kirishima's growth spurt.

Kirishima starts to sing, "You put the left foot in front of the right foot, you put the right one infront-

"No, I'm struggling to pace with you, shitty-hair."

"My hair is just like yours," Kirishima gets the biggest shit eating grin.

"Fuck off." Bakugou stomps forward.

"Wait! I don't know where we're going." Kirishima trails behind.

They made it to the restaurant. Kirishima ordered mild wings. Bakugou ordered three skull hot ones.

"I love this place."

"Really, bro?" Kirishima asked, feeling special that his crush took him somewhere special to him.

"Yeah its the only place that really knows how to make a good hot sauce." Bakugou smirked, "it's the best part of wings."

"The best part of the wings is the meat. I like ‘em thick and juicy."

"It's the sauce."

"If you don't have the meat, how are you supposed to get the sauce in your mouth?" Kirishima feels like he got a checkmate.

"Celery. Carrots."

"No. Rabbit food doesn't count."

"Fine," Bakugou shrugged, "I'll chug a bottle of the stuff, watch me."

"You're not going to get full off of that... That's why you need the meat."

They hold this heated debate until their sauce covered meat is placed in front of them.

Kirishima takes his bite, looks at the meat suspiciously.

"Is something wrong with it?"

"No... just different."

"Good different or bad different," Bakugou didn't want to eat unsafe food.

"Different." he takes another bite. Investigating it with each chew.

Bakugou thinks fuck it, and takes a bite of his own, "fuck!"

His eyes water and his mouth is on fire, but not in the good way.

"What's wrong?" Kirishima asked.

"You have weak fucking taste buds."

"Oh!" Kirishima had a light bulb moment and switched their plates, "That's why I didn't enjoy the mild sauce. I have your taste buds."

Bakugou grumbled, but accepted this trade. Mild was actually pretty okay. And with these razor sharp teeth, he was gliding through the meat. He had to be careful not to slice through the bone.

It was weird having Kirishima's mouth as his mouth. Bakugou didn't realize how much thought Kirishima had to put into each bite. He made eating with knives for teeth look effortless as he spoke so much when he did it. How did he not chop off his tongue?

"Can you harden your tongue?"

"Yep. Every part of me, try it." Kirishima adds, "but be careful, you don't want to hurt your teeth."

"Will it chip your teeth?"

Kirishima thought hard, "I don't know... It hasn't happened yet."

Bakugou tries it. It's like having a rock in your mouth. Doing his best to focus on it, it's such a small area to keep hard. The hardening keeps wanting to spread to his cheeks. This would be a good exercise for Kirishima if he doesn't already do it.

After playing with the tongue in his own mouth, Bakugou wonders what it would be like to French Kirishima. In a totally scientific way of course. Would Kirishima harden his tongue, what would that even feel like? He can feel it now, that's how the quirk works.

Kirishima's body is actually very numb to a lot of external stimuli. It takes a long time for it to feel pain even when the quirks not active. While that's good for his future job, its probably bad to not be able to feel pain for his long term health.

Though, Bakugou is pissed that the one thing Kirishima's body will send pain stimuli to is his favorite wing sauce. Which Kirishima hasn't even taken a bite off that ungrateful bastard. He's just looking at it like it will set him on fire. The switch-a-roo was his idea.

"Just take a bite already, my body can handle it."

"I'm scared."

"It's just hot sauce. You literally took down a mafia villain once."

"Yeah but that's different. This could upset my tummy."

"It's not your tummy, dummy. It's mine and it's not weak. So enjoy the best wings."

The sauce doesn't murder him. It actually tastes really good! The heat carries a sweet undertone to it. If this is how Bakugou tastes spicy food, Kirishima gets it now. It's got a depth of flavor all of its own. The pain also adds a bit of an exciting kick at the end.

"You're so manly." Kirishima compliments. Even Bakugou's meals are little mini battles.

Kirishima is not used to having to chew so much. It's so hard to eat food. No wonder people get tired after eating.

Kirishima noticed another thing he wasn't used to, "I think I'm cold."

"Well yeah its fucking freez-" Bakugou actually paid attention to the temperature of the room, "it’s not bad."

"Yes it is. It's super cold." Kirishima said.

Bakugou didn't have to layer up! He could just dress normal. It's so freeing. He could jump into a pile of snow if he wanted to. Too bad it's summer. He wants to test his new super power out.

Bakugou takes off his jacket to hand over to his cold friend.

"Here."

"Thanks!" Kirishima said, "its kinda like we're on a date." Then immediately shoved an entire chicken wing in his mouth.

Some people might think it's weird to sit across from yourself. It's really not. It helps that Kirishima is so expressive that it's unmistakably him. The way he smiles. The way his cheeks have a soft blush of pink when he's embarrassed.

Yeah Bakugou could identify Kirishima no matter what form he's in. Meatball, dog, and even in himself. There's nobody else he would trust with his body like this either. Bakugou knows Kirishima will keep it safe and not do anything stupid with it.

"Yeah..."

"Wait. What? Really?" Kirishima spat out his food in disbelief.

"Yeah, sure," Bakugou said, "Why not."

Hopefully that would protect him if Kirishima was just joking earlier.

"Are you just saying that to not hurt my feelings?" Kirishima twisted his face to insecurity.

"No. Just don't do that to my face."

"What?"

"Look all insecure and shit. I'm sick of it on your face, but it's not good for my brand either."

"I'm sorry."

"There it is again!" Bakugou shouts, "stop it."

"Sorry!"

"You are Kirishima Eijirou, and I've been in your body for less than 5 hours and have no idea where you got all this insecurity from. You can shatter a concrete wall with your bare hands."

"It's just concrete training walls." Kirishima deflects.

"6 inches of solid concrete isn't impressive to you?"

"Well they are training walls so they are super breakable. Real walls are stronger."

"That's not how concrete works."

"What?"

"It's not sentient, they don't go, 'Kirishima is training today so we'll go easy on him.'"

"I know that much." Kirishima blushed, "I just figured they constructed them with weak points to make it easier to break."

Bakugou laughed.

"What?! Cementoss took three days to make our dorms, and you think they are to code?" Kirishima added, "Now who's the foolish one?"

The next thing they did was touch each other's junk.

"Bakugou, don't be mad."

"... What did you do?"

"It's not what I've done, but what I need to do."

"... What do you need to do?"

"I have to pee!"

"Okay?"

"In your body!"

"Okay."

"I'm going to have to touch your," Kirishima looked around, and whispered, "penis."

"Yeah, that would help." Bakugou said, "don't want to make a mess."

"How are you so nonchalant about this? You should be chalant!"

"It's just piss, you do it every day."

"Yeah but with my," Kirishima looked around again, "penis."

"I doubt my dick is that much different than yours. It has a hole, you aim and fire. Not that hard."

"But we just started dating, and we haven't even kissed yet. I can't see your penis before kissing you. It's not manly."

"And you think, what, pissing your pants is more manly?"

"No!"

"Then what do you want to do about it?"

"Ask you to help?" Kirishima couldn't have meant that.

"What?"

"Yeah. I'll close my eyes the whole time, while you do all the hand stuff to your penis." Kirishima said like he came up with the smartest plan in history.

"So you know I'm in your body. So it will still be your hands that touch my body."

"But it's more you than it is me. You know like the axe that gets his head replaced. Which ones the original axe type deal. The head or the stick. Except it's a soul and a penis."

"Just take a fucking piss, Kirishima." Bakugou ordered.

"But I don't want to." he does the potty dance.

"You gotta. It's not that hard and it doesn't count."

"But we haven't kis-

Bakugou plants a rough kiss on his own mouth, and never felt more like a narcissist than this moment, "now we have, go pee."

Okay, Kirishima, he's got this. It's just a penis. It's not the first time he's seen a penis. He operates one every day.

Point and shoot.

Point and shoot.

Point and sh-

He unzips the pants, pulls down his boxers and out comes the cutest dick he's ever seen. It's perfect. Better than he's ever imagined. How could Bakugou be this perfect? And he's going to ruin his first time seeing it with pee.

Don't look, Kirishima.

You got this.

In another bathroom later on Bakugou wonders if Kirishima's shitty growth spurt came with a third leg. The fact Kirishima has ever been insecure about anything doesn't make any sense to him with this behemoth in his pants. Big Dick McGee.

The last thing they did was tell Aizawa... Which, looking back on it should have been the first thing they did.

"How long have you been like this?"

"Since this morning!" Kirishima said.

"We went to the store for some basics, some kid ran into us, and when we got back to the dorms we were like this."

"Well if you would have told us earlier we could have prevented this from happening to 20 other people."

"Like, 20 pairs of people or just 20 other people?" Kirishima asked

"Does it matter?"

"Yeah, 20 pairs is like double than 20 people."

Bakugou agreed with him, "That would make it twice as bad."

"I don't have time for this. I just came to say it wears off in about a day, so when you wake up you should be back in your own bodies." Aizawa said, "The kids' parents told me it's best if you stay close. It helps with the transfer process."

"Sleep over?" Kirishima asked.

"Sure."