Possible outcomes:
1) He passes out (either by shock or drunk)
2) The other girl enters the room
3) "Wait! we can't do this!" and runs away or smth
Either way, that bitch is taking advantage of him being drunk so yeah, what a dick
it is NOT, how many times do I have to say it? The doujin is just an IF, sensei is just a slight b1tch, that's it. the doujin doesn't have anything to do with the next chapter