It was one I read a while ago it was a group of girls in bikinis going to the beach where they meet some guys and start having sex (atleast I think it was a beach, I’m 99% sure but I do know they were wearing bikinis)
It was a black and white manga (the art was pretty good) and I believe there was one girl who was the “expert girl” she was showing the rest of the girls how to give blowjobs and such
There was a panel where one of the girls was staring at the “expert girl” girl giving blowjobs to two guys, the girl staring had heart shaped pupils and was making an ahegao
My details might be a little fuzzy, but I’m sure I got the gist of it!
Help would be much appreciated! (Sorry mods I cross-posted, but I really need to find this Manga!)
Edit: maybe rather “expert girl” had black hair and they never actually called her that, I just gave her a title lol