Responses
http://www.mangago.me/read-manga/kocchi_muite_ai I'm pretty sure it's this one.
That's the whole point! The protagonist wanted to get as close to having sex with his straight best friend as he could. Wallbanger types xD
Thank YOU!! You're a gem :D
Read it looong ago. The plot was something about a guy who was in love with his friend from college so he let his friend and his girlfriend sleep together in his flat. The protagonist's neighbor also goes to the same college and finds out the protagonist likes the other guy and screws him while the best friend is screwing his girlfriend in the next room.
If anyone knows this pleaaseee tell me