Hi! I'm looking for a shounen ai manga I read a long time ago about these two boys that were childhood friends and I remember one of them was really short and had a twin sister and the other one was tall and the manga had a kind of prequel that featured the main characters dad when he was in boarding school and the main character was friends with his dad's old friends that were a couple.

Recommend me horror , yaoi and shoujo manga please 😀