Warning: this is hardcore graphic sex
It has similar points: two guys having sex. Two other guys happen to see them and then have sex too. **this part of a collection of 4 djs for the manga Gravitation
http://www.mangago.me/read-manga/gravitation_dj_megamix_capybara/
http://www.mangago.me/read-manga/sweet_inomoto_rikako/ maybe? ch 6 sounds similar with yours
That's not it, but thank you for the effort (I'm gonna check it out anyway) ヾ(❀╹◡╹)ﾉ~
Yesssssss!!! Wowww!!! That's the one. Thank you so much (づ￣ ³￣)づ
That's it. I'm happy, thank youuuuuuuuu (づ￣ ³￣)づ
Thanks a lot ヾ(❀╹◡╹)ﾉ~
I'm trying to remember this manga. I can't remember anything except this one scene. They're in a high school setting. One day mc saw his crush/friend having sex with some guy accidentally. His crush/friend and the other guy were in some kind of storage room or clubroom. I think he was outside with his friend and they saw them having sex through a window. The guy next to him looked at them and offered to do the same thing with him, they did it and became a couple in the end. It sounds ridiculous, I know. I'm probably making this all up, so anything similar to this scenario is also acceptable. Does it ring any bells?