Letting the other guy touch him and can't fight him. What more if there's also a guy who can push him then he got all horny — Ey. I don't know anymore
I think at that point it's less cheating and more non-consensual sex aka RAPE. In fact, the entire basis of his relationship is sexual harassment but what do i know
the possibility of mc cheating is 0 Hime is just baby
Letting the other guy touch him and can't fight him. What more if there's also a guy who can push him then he got all horny — Ey. I don't know anymore