Nemaki

Hey! I want to find a yaoi I've read before. It was between 2 students, but top was a bit older than bottom. Bottom is gay, has a petite figure and can be mistaken as a girl, he's sleeping with his teacher sometimes. He's got an older sister who's going out with a guy, who is the top cause later they'll fall in love with each other. The day they meet, bottom collapse cause it's too hot and top "saves" him, that's a bit of a reason why bottom falls in love with him, but also because they really get along well. But since top is going out with his sister, bottom decides to avoid him to not destroy their relationship. Top feels sad about that but later they meet again and decide to go out for real, after top and bottom's sister decide to break up. The sister feels jealous at first, but then she lets it go cause she loves her brother.
I think bottom and his sister didn't have parents cause there was a weird uncle who took care of them lol.
Does someone know this yaoi?

Hi again! I want to find a yaoi I've read years ago. It was maybe more shonen ai than yaoi but well. It was between 2 guys, top was a vampire whith white skin and black hair, and bottom was human and had white skin and white hair. They were best friends, bottom didn't know top was a vampire. But one day, top bit bottom by accident (lightly I think, while drunk?) making him a sort of blood slave by mistake (or a vampire or both, don't really remember). Bottom had an incredible good scent for top, and maybe other vampires as well. One vampire wanted to steal bottom from top I think.
Does someone know this yaoi?