Okay so as far as i can remember there is a nice nerdy girl thats taken to a bar and ended up having sex with some guy and said the words "youll open your legs for me if i told you" or domething like that. He then proceeds 'training' her as his onahole. She has this childhood guy friend who likes her who is actually the kouhai of the guy whos been doing her. The childhood friend is annoyed at the senpai because he always bragged about the girls hes fucked. Then noticed that she is part of it and became angry.

Nevermind i got it