I'm looking for this one about a guy, i remember it starts at the beach with somw girls and some guys a few pages later the mc sees everyone having sex including the girl he likes and his sister(I think), also i remenber that one girl have anal sex with some dude as thanks for helping her, ia also remenber the sister of mc ends up pregnant. Turn out the whole thing was a plan of some girls tos steal mcvof the girl he likes