Responses
Súper happy that someone answered, but I remember that they were best friends, not siblings. :(. Anyway sorry but thanks!
maybe otona keikenchi idk maybe(￣∇￣") (idk how to share a link sry) in this manga there is the second couple who are friends before getting together the uke used to sleep with whoever the seme slept with and ask them later about their experience with the seme and he has a huge crush on the seme for years (that's what I remember) (⌒▽⌒) hope this is what u are looking for and sry if not
I'm looking for this yaoi manga about a guy that dated girls and his friend that slept with them right after they slept with his friendo justo to hace some indirect sex because he has a crush in him. (Alzó they were hihg school students).