
Almost nothing happened.
The boyfriend is cheating on him too with other dude and he says that he is already tired of the MC. He goes to MC’s apartment, he sleeps with him, but MC keeps thinking in Yuki. The boyfriend thinks that Yuki is straight so there is no way he is cheating.
Next day, Yuki and MC have sex during work.
Yuki and MC are friendly talking at the school and the scum boyfriend separates them.
I mean, couples have a lot of sex when they start dating. So it is kind of realistic in that way