I know I've been doing a lot of Koy, I might do someone else next time to give Koy a break 

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Aizawa let out a sigh, remembering what happened a year ago. "Mr. Aizawa..." he looked over, seeing Kay and Bakugou in their hero gear. "Ready to go, already?" he asked, standing up as they nodded. "Okay...let's go." 

The three headed to Tartarus, the prison for the worst of the worst villains. Kay was looking out the window, feeling nervous. Bakugou sat next to her, trying to comfort her as Aizawa drove, the car filled with tension so thick it could be cut with a knife. They didn't say a thing, knowing what was happening. 

After a while, they arrived and headed down the hall. They sat in a room with a window to show the other side for communication. Soon, the guards brought someone in on the other side, he was wearing a straight jacket and a muzzle...it was Koy. 

"Tch, is that stuff really necessary?" Bakugou asked, glaring at the guard, making Koy chuckle. "They don't like it when I bite," he said casually, making the other three feel tense. "Koy...we want to try and get you out," Aizawa told him, crossing his arms. Koy tilted his head slightly. "Oh...? But killing a hero is a serious crime, heh, do you think they'd let someone like that out?" he asked. He seemed...so different. He looked crazy and was calm...almost too calm as he spoke. 

"Koy, you were pushed over the edge..." Kay said, stepping closer to the glass. "Maybe...but I'd do it again if I could," he said, looking at her with a grin. She felt her body tremble, making him laugh quietly. "What? Scared of your brother? Heheh...come on, you didn't do anything to me...I'd never hurt you...never..." he said, letting out a deep breath. "I made sure that bitch would never hurt you again..." 

"Koy, this isn't you." Bakugou said, clenching his jaw. "Hm...? Not me?" he asked, tilting his head some more. He grinned wickedly, making Bakugou tense up. "Heh...you know better than anyone...that I wanted her gone..." 

"You're not crazy!" 

"Yes, I fucking am, this straight jacket says so." 

"Damnit, Koy! Just let us get you out!" 

"And what? Let me kill all the other assholes that did me wrong? Hehehe...you think I've been regretting my choice? As soon as I killed my mother, I changed. Something in me snapped, seeing how easy it is to get rid of people who do me wrong. If I get out, I won't stop, I-" 

"That's enough." Aizawa finally said, glaring at his former student. "You don't deserve this...all you've been doing is thinking about what you did, and that's not doing shit. You're a child...you deserve to be treated as one." 

Koy blinked, his smile fading. "...A child...?" he asked, leaning against the wall. "No...not anymore...I stopped being a child when I was 7...because I had to protect my sister...to survive my mother..." He let out a sigh. 

"You've been coming about every month just to keep my sanity in check...but it doesn't matter, because I am not the old Koy..." Kay teared up slightly, putting her hand to the glass. "Koy...please...I miss you..." 

Koy looked at her, being quiet for a moment. Suddenly...he punched the glass, it didn't break, but it made Kay take a step back, their eyes widening, seeing he had gotten himself out of the straightjacket "...I'm sorry...but I don't belong out there anymore..." 

Soon, sirens went off, and guards went into the room, pointing guns at him. "Don't move!" one of them yelled. Koy put his hands up, keeping his muzzle on. They started to take him away, but Bakugou suddenly slammed his fists on the wall. "Don't you dare take me him away! We're not done!" he yelled, clenching his jaw. "He needs to be locked up, we ca-" 

"DON'T TAKE HIM AWAY!" Bakugou looked at them, tears streaming down his face. "Maybe you're insane now, but you're still my brother! I didn't give up on you then, I'm not giving up on you now! Listen to us, you're not a monster! Don't keep yourself in here! Don't you see?! If you stay in here, Lanni wins!" He yelled, Koy's eyes widened. "N...no...she can't hurt us...she-" 

"She's hurting you! Even though she's gone, she's clouded your head in making you think you're a killing machine!" 

"Stop it..." 

"You're letting her in your head! You'll never be free if you stay here!" 

"I have to stay..." 

"No, you don't! You can-" 

"I won't risk it! I'm mentally unstable! If you make me snap, you'll be next! I can't risk it!" Koy yelled, looking at Bakugou with tears in his eyes. "I...I can't...hurt those I love...as long as no one I love is hurt...then I win..." 

After that, he was taken away. It took the three a moment before they left, feeling worse than when they got there. "It's not fair..." Kay said, wiping her tears. "...I know..." Aizawa said quietly. He let out a shaky sigh. 

He missed his student...