Maybe he hadn't meant to grab Simon so roughly. He's been working out a lot, perhaps he no longer knows his own strength. Still ,there is something satisfying about seeing him squirm. He waits til Simon pulls away again and tightens his hold, then releases him all at once. He hopes the momentum makes him fall. That would also be sort of satisfying, even if Simon isn't the one with a tail.
A few hours. What is he supposed to do with a tail for a few hours? "I didn't do this," he says evenly, eyes trained on Simon in a flinty stare. "You did. And last I checked, you were an adult as well. Act like one."
A tail. Knowing it'll disappear in a few hours doesn't make it any less hard to swallow. He'll be stuck walking around like this, forced to endure stares, whispers, giggles and conjecture. All for one crazy twink's idea of revenge. Milo has not been so livid in a while. He gives Simon one last cold stare and turns to walk away with purpose and as much dignity as he can muster, silky tail swishing behind him.