Responses
It's not really dubcon, because MC is sober and consenting. It's just he consenting with his body, not his mouth.
I think Kazu also caught on when MC kissed him in the karaoke booth - you can see them both blushing while kissing - otherwise he wouldn't have made a move on his "straight" friend. The next time he kisses MC, in his house, he specifically says "no, you are drunk" when MC says he is sober before kissing him.
Kazu pretends to rape a "drunk" MC to give him an out. But MC also gave his friend an out (from guilt of "raping" a friend) by pretending nothing happened.
I enjoyed this one a lot, the only detractor was the dubcon aspect although, I guess I understand it