[Alcohol is for losers and delinquents, but Katsuki has learned a lot of news in the past couple of weeks and life is short. What starts as mild curiosity becomes several drinks and a couple of hours later Katsuki is stumbling over to do karaoke, his suit and skull tie wrinkled and hair messier than usual, swaying with the microphone in his hands.]

You're all a buncha losers and I'm gonna show you how this shit is really done. I'll murder all of you with my vocals!

[He blinks a few times.]

Stark's AI. Play that one ABCD song about killing and hell-!

[He doesn't even remember the song. But Katsuki will be screeching into the microphone, shouting at the top of his lungs in some semblance of a melody.]

DIE, DIE, DIE, KILL, KILL ALL THE LOSERS!!!! HAPPY BIRTHDAY, STARK-SENSEI!!!

[Dropping the mic, his palms light up as he fires off small explosions.]