I have read it before but dont remember the name of the manga. I think is Minami haruka's work or something but not sure and i didn't find it.. So i hope u guys can help me and its yaoi by the way ^^ Its about a boy who went to wake his senpai (in dormitory) and suddenly his senpai kissed him and called out someone's name. And the other part that i remember was that he's going to the bathroom and sees his two senpais having

sex and then freez. Then his senpai remembered what those two are gonna do then went to find this boy who went to the bathroom and finds him in front of the bathroom's door sitting on the floor and didnt moved. That's all i can remember.. Sorry if it was complicated "^^ my english sucks "^^

Honey Boys Spiral

you were right about the author.

and a little bit search would lead you the result.

thank you so much. sorry im so stupid for not realising