CW: not smut, but it does mention them getting it on in the past and there is a make out sene.
⚠️angst⚠️
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It had been an accident at first.
Obviously, Tomura and the rest of the league needed food to live like everyone else, which required going to the store, and bursting in and taking charge everytime when they were currently trying to lay low to work on a larger scale plan was not ideal. And it's not like you can just go shopping casually when you're the number one wanted Villian in Japan, so Tomura had recently begun going out in disguise.

And, in a different way, it wasn't good for Proheros to go out on errands either. Especially not when you're a hero who dislikes attention and media, like Eraserhead. So, he too wore a disguise whenever he left the house. It had been pure coincidence that the two opposite men decided to go shopping at the same time, in the same city, in the same store. It had been a coincidence that they both needed potatos. And it had been coincidence that they went for them at the same time. It was accidental when they touched hands and made eye contact. Neither man, despite both having numerous fans, could remember the last time they'd slept with anyone. Unknowing of who one another was, they found eachother attractive. The best part? Shigiraki was fully, 100% about to just walk away. Forget about it by the next day- but Aizawa was much bolder, and he could tell the stranger in front of him was just as attracted to him and he was to the other, so he spoke and they started talking, and Shigiraki had ended up at Aizawas appartment. It was just meant to be a one time thing with a complete stranger, and neither would ever speak or even think about it again. But both men considered the other to be the most amazing sexual experience they had ever had, and neither wanted to walk away. So they did it again and again and again until they decided they needed to at least exchange names, and when Aizawa went first, Shigiraki felt as if he would have a heart attack then and there. Under innocent pressure from Aizawa, Shigiraki revealed his identity in return and Aizawa felt just as shocked, if not more so.
But despite a supposed hate for one another and opposite life goals, despite it being potentially the most morally incorrect thing they could do, neither could let the pleasure the other brought go. So, to hell with it- they kept doing it.

But then Aizawa started dating someone else. Probably.

Shigiraki noticed it. During his attacks on the school. And Toga was a gossip, interested in realtionships. She never had any clue about Shigiraki and Aizawa's connection- no one did- but when she noticed Aizawa getting comfy with someone during her transformation sneak-ins, she mentioned it with interest. Thats how Shigiraki figured out it wasn't just in his mind.

His romantic interest in Aizawa was honestly very little, if any at all, but still, Shigiraki was a jealous man. And he figured Aizawa must be at least sorta into him, right? But this new boyfriend- although weather they were actually offical, Shigiraki didn't know- was nothing like the blue haired Villian. He was more the opposite. He was a hero, for one. And he was confident and blonde and....loud.

Shigiraki couldn't help but be upset. But of course, Shigiraki had no plans to mention it. How could he? They had no emotional connection, not even a little. It was wildly inapproprite for him to be jealous, and he was worried about what Aizawa would do, and even worse...what he would think of Shigiraki after that.

Okay, so maybe Shigiraki had become a little emotionally invested in his night partner. But was that a crime?

....It sorta was a crime, actually. But he's a villian- when has he ever cared about morals or crimes?

Oh, but his worst fear was that Aizawa would stop coming altogether. But he didn't. He kept showing up, texting Shigiraki in the middle of the night.

But things started changing. Aizawa started smelling like this awful cheap colonge, and he had lip stick on his body and on his mouth, smeared from another. He suddenly knew how to do new things with his body, and Shigiraki knows he sure as hell didn't teach him that. He started wearing jewlery. Aizawa didn't wear Jewlery! Oh, but anything this new man gave him, he'd take.

It disgusted Shigiraki, and he was starting to crack. His jealousy burned like a fire. But he couldn't lay a finger on this man. For one thing, this other man was a pro himself,

Shigiraki was pretty sure. Two, if Aizawa found out, he'd ever forgive him. And three...it would make Aizawa sad. And as much as he hated to admit it, the thought of that was worth keeping this asshole alive. At least, for now. But how much longer could he resist the urge to turn that blonde freak to dust?

That night, Shigiraki got a sudden text from his secret night toy.

"I'm coming over."

He knew he didn't need to ask. Shigiraki never said no. Neither of them did.
Shigiraki had bought an appartment just for this- he'd never tell Aizawa, but before they started sleeping together, he had slept at the base. Obviously, he couldn't bring him there, and he couldn't do it at Aizawas every time, so he bought a place for them.

It used to smell like Aizawa, but now it just smelled like that disgusting colonge that Shigiraki could barely stand. Shigiraki headed over there, lighting a cinnamon candle to try to rid himself of the smell. He knew he had awhile- Aizawa lived a decent amount away- so he took himself to the bathroom to bathe before Aizawa got here. He didn't used to, but somewhere along the way, he started really caring about looking decent for the other. As he climbed out the shower, he caught his eye in the mirror. They were so different, him and that man. He was pretty sure Aizawa loved him. But why? Why him? He figured even if Aizawa loved him, he'd never act on it, being a pro hero and all. Aizawa was a smart and practical man.

He'd never ruin his own life just for a boy, especially not someone like him. But why did he love this man specifically?
'Maybe he'd like me more if I looked more like him?' Losing himself in this thought, he twisted and turned in different ways, taking himself in. Yes, they were nothing alike. Shigiraki grabbed the ends of his hair and held them up in the air, trying to imagine what he'd look like if he looked more like him. He shivered in disgust when he realized what he was doing. Since when had he become so pathetic? He spent more time thinking about an accidental hookup- and with a hero no less- than he did thinking about anything important, like his plans or the league or All For One, or anything at all, really. He heard a knock at the door and shook off the thoughts for now. He didn't bother to dress. He'd just end up taking it all off anyway. He did put on a towel though, not wanting anyone else to see himself bare when he opened the door.
He opened the door and took the other in. That long, thick, black hair he so loved to run his hands through. His baggy clothes had hid his surprisingly muscular body. Those pircing eyes that nearly saw through his soul- thank god they never quite reached it.
"Hey. Can I come in? It's cold."
Blunt and to the point as always. It was refreshing. Aizawa just...spoke. He just said what he meant. He wasn't afraid. Shgiriaki would never understand how he could just do that so effortlessly. "Yeah, yeah. Come in." Shigiraki held the door as Aizawa walked in, closing and locking the door behind him. Afterward, he turned to look at the other, meeting his eyes. "Are you already hard?" He asked, trying to sound focused. Thats always the way it was- no small talk. It was just a hookup. Sex was all they could do or say. "Yeah, I'm good to do. Come here." And then he smirked. Oh that goddamn smirk. Shigiraki always melted under its presence. 'But with him he doesn't just smirk...he smiles.' He attempted to shake the thought away by grabbing Aizawa by the waist and pulling him in, kissing his lips roughly. Aizawa wasted no time opening his mouth to allow Shigirakis tounge to dominate his own. Shigiraki already felt a million times better. Now he could just focus on his body, not his heart. Aizawa reached up to grab a handful of Shigirakis hair, using his other hand to push Shigirakis towel down. Shigiraki lost himself in the sweet taste of the man he so admired, closing his eyes and focusing on how it felt. Hard, and fast, and so...easy. It was so simple. And then all there was was him and his man, soft moaning and touching and a hard on against his leg and the smell of-
Colonge.
God fucking dammit.
Unable to stand that damn smell, Shigiraki fully away suddenly, almost shoving the other away, his head spinning as he clumsily stumbled back into his kitchen counter.
"Shigiraki? Whats wrong?" He asked, but he didn't care, Shigiraki knew. Aizawas voice was monotone and empty. He wanted 'Yeah, I'm fine.' Not an actual answer. Shigiraki forced himself to meet his eyes. Shit shit shit! That was weird. He had no explanation. That was so weird of him to do so suddenly. In Aizawas view, this came out of thin air! "I'm fine." Shigiraki answered, cursing how shaky his voice was.
"Is this a bad time?" FUCK. No no no no no! If he thought Shigiraki was some weirdo, he'd never come back! "No!" Shigiraki yelled a little too suddenly, and a little too forcefully. Aizawa raised an eyebrow.
"You're acting weird." 'Quick, I need an excuse! Say something! Anything!' he begged of himself. "I-I, um- smell!" He blurted. 'Okay not anything, say something that makes sense, dammit!'
"I mean, you smell. Ah, not like bad! You smell different is what I mean! Not that I know what you smell like or anything! But like, I do pay attention- but not like, in a weird way! Fuck, shit, no, I mean- sorry!" Shigiraki covered his own mouth, trying awfully hard at this point just to shut the fuck up. He took a nervous glance at Aizawa. Dammit, he was looking at him like he was crazy! Ashamed, Shigiraki became aware of how red his face was. There was a long moment of silence. And then Aizawas phone rang. Both men jumped at the sudden noise. Aizawa fumbled for his phone, dropping it in the process. Having been already looking at the floor in pure shame, Shigiraki caught the name. That goddamn blonde. Shigiraki tsked and looked to the side. "Looks important. You should take it."
Aizawa picked it up and turned it off. "It can wait"
"Can it?"
"Whats that supposed to mean?"
Shigiraki looked up, trying to stare Aizawa down. Aizawa looked at him confused for what felt like hours until his eyes widened with a kind of realization. "Toga."
Shgirakis own eyes widened. No. No no no. He didn't figure it out. He didn't know. He couldn't. "Huh? Toga? What about her?" He coughed awkwardly, attempting to hide his shaking voice.
"Just a few days ago, I caught her, disguised in my class again. Shes a lot like Mina."
"Who?" Shigiraki asked. It was a genuine question, to be fair.
"The pink one, with the acid. Smart. Personable. Friendly...or should I say, Chatty."
"You don't know what Togas really like. Could just be acting it up." Shigiraki tried to come up with an excuse, knowing full well where this was going.
"I've met enough people like her to tell. Loud, interested people. Not that theres anything wrong with those people. I quite like them, really. After all, Mic is like that."
Shigiraki, forgetting himself, scoffed. There it was. That name. "You heard about him."
"Maybe. Like you said, Toga is chatty. She says lots of things. I can't keep up with everything she says."
"Then why did you keep up with this one?" Shigiraki opened his mouth, but found he had no answer.
There was a moment of silence. And then,

"You're jealous."

Shigiraki forced a laugh. "I don't know what you're talking about."

"Shigiraki-"

"I don't. That doesn't make any sense, you're just seeing things that aren't there, you-"

"You've never acted so weird before"

"I'm not weird! You're just...tired! Theres nothing abnormal about any of this!"

"Shigiraki."

"You must be out of your mind if you think I give a shit about anyone at all, especially some- some sorry excuse for a hero!"

"Shigiraki, calm down."

"And now your telling me to calm down?! Who do you think you are, you a-"

Aizawa lunged forward, slamming Tomura against the wall, one hand wrapped around his throat, the other grabbing the hair in Tomura's face and pulling it up roughly, so Shigiraki was forced to have no where to hide, to look at him. His power activated, hair up and his eyes shining red.

"Shigiraki!"

Taken by surprise, Shigiraki looked up at him, silenced. He had never been more helpless. He'd never seen Aizawa use his quirk up close. He'd only ever seen him use it once, in face, at USJ. Somehow, he fell even more in love with him. His eyes that always came close to seeing Shigirakis soul finally broke though. Shigiraki lay bare, everything in his head, soul, and heart for Aizawa to see. He knew then there was nothing he could do. This was the end.

"Tell me, Shigiraki." Still unable to get himself to speak, Tomura didn't move. Aizawa tugged the Villians hair roughly, earning him a yelp from the boy. "I said tell me." When Tomura still didn't answer, he got angrier still. "Now!" he practically screamed, spitting in the others face.

"You're right," Tomura mumbled, looking down in shame.

"Look at me." Tomura closed his eyes tightly. He couldn't. He'd fall apart if he did.

"Look at me, Tomura." The use of his first name, which he never even dared to dream Aizawa would ever speak, surprised him so much, he opened his eyes and looked up on instinct. The moment he did, tears formed in his eyes. He tried desprately to keep them at bay, but a few fell, the dam begging to break. Aizawa looked angry, and it broke Shigirakis fragile heart.

"I want to hear you say it." Shigiraki knew he had no choice. He needed to get it over with, so this moment would be over. The shame, the heartache, so this man would leave his life, and he'd never have to face him directly ever again.

"Y-You....y-you're right. Toga....s-she told me. I-I've known for m-months. I-I...I didn't care, at first, but...." Shigiraki swallowed a shaky breath. He didn't want to say it. Saying it would make it true, would make it real.

"But what, Shigiraki? Say it."

It was his only way out. Aizawa wasn't one to let things go or to give up, Shigiraki knew that.

"B-But...after awhile I....I was jealous. O-Of him. I t-thought it was just because I c-could tell he loved you. A-And I've never had that. No one will ever love m-me. But it w-was more. It was because it was you. I don't know when I got attacted, I never meant to, I didn't even know how I felt until he was...I know it's stupid, you don't care about me, and even if you did, I-I'm a Villian. I'm the bad guy, yeah?"

Shigiraki was sobbing now, and the laugh he let out was full of pain and sadness. "I'm sorry. It wasn't my place. I should never have been allowed to have the privllage of being in love with you." Shigiraki had stopped looking at Aizawa awhile ago now.

"Don't make me look at you," he whispered painfully. "I-I've never fallen apart this hard, I c-can't handle any more, please!" he begged. "I-I'd rather die. I know I don't deserve it, but spare me. Save me this kindness...please. I-I'll never bother you again, I swear. A-And I'll give up on trying t-to defeat Izuku Midoriya. I promise. Afterall, that w-would mean having to see you again, and I...I can't. I can't."

There was a silence. It felt like years to Tomura. Finally, Aizawa let go and Shigiraki fell to the floor, his legs rendered useless. Aizawa, wordlessly and seemingly emotionlessly, turning on his heel, opened the door, and walked out shutting it behind him.

Tomura instantly broke out into a heavy sob. He grabbed the nearest object, a nearby vase, and slammed it onto the floor as hard as he could, screaming with the pain of anyone whos ever been hurt. The worst part is he didn't blame Aizawa at all. He had meant every word of what he'd said to him. He didn't deserve love. He deserved this.

All his misdeeds, all his sins come back to haunt him. Later, when he was more in his right mind, he'd wonder helplessly what Aizawa would do. Would he tell people? Did he have proof? Even if he didn't, people would believe him. A hero or a villian- who would you believe? He even looked like a loser. The kind of guy who could never and would never be loved by a single soul. And the leauge. He'd never admit it, and he was sure they didn't feel the same, but he saw them as friends. Once they knew how pathetic he was, they'd hate him, and they'd all leave.

He'd be alone.
Again.

God, he wanted to die.
But that would come later. For now, he raged. Not against Aizawa, or heros, or the unfair world- Against himself. He screamed and broke everything in sight- tables, items of value, his computer, his wine bottles, things he cared about- he figured he didn't deserve any of it anyway.

And at the end of it all, there he sat. On the floor of the kitchen where he lost everything, voice burnt out, heart broken and surrounded by the remains of his destroyed home.
Nothing left.