Wow, he said "I love you" and she replied "...yes", not what I expected, but something that's fits this series very well...
Sister is a bitch, but to be honest the fact that Meguro-san had a lot of boyfriends before, with whom she was in sexual relationship with is kinda sad, don't get me wrong there is nothing wrong with having many partners (although you could argue about the sensei thing), but the fact that she doesn't do it because of herself, or out of enjoyment or anything, she just goes along with anything because she doesn't care, that's sad and I hope it will change in the future in this relationship, because so far she again just goes along with anything she doesn't neccessarily wants to do