So all I remember from the game is that it's RPGM, the guy has a girlfriend who is in school and he has to work at different places around town, and one of the places is the love hotel, the exact same tileset as the love hotel from that SAO breath of something game, and he gets a call to bring more condoms to a room upstairs where the dude is fucking his girlfriend without him knowing. I think there is also a route where the guy keeps taking her to the karaoke bar and the boyfriend can also work there and hear them. I think the girlfriend has short blonde hair but I'm not sure, and I think she is blackmailed into it in all the routes. thanks and good luck.