That moment the casual haha funny bullying turns into a kink because he's a masochist that gets off to being glared at with hatred, who doesn't know about it, right? Seme wants revenge on the bully that doesn't remember him (at first) and whoops, it turns into him figuring out he's a sadist (perhaps only towards that one specific person, though). It's toxic, by any definition probably, but perhaps that toxicity of them both is probably why they actually match weirdly well. It's not really an open ending in itself, but still a little too ambiguous for my taste. The Uke is hot though.
Mobius Strip