Looking for a certain yaoi manga

it's about a boy (I think he was like nouveau riche) who got sent to a verrrry high class boarding school. In this school, underclassmen and upperclassmen team up in pairs (??). There's the king of the school who doesn't pick anyone bc nobody's good enough or something but everyone is THIRSTY for him and they want to drink his semen lmao. When the new boy can't sleep he ends up in a church where the king boy is and they find out that the new boy is the son of the one person the king boy admired when he was a child, so he makes the new boy his pair. Then he gets obsessed w/ the new boy and locks him in his room

I KNOW SO MUCH ABOUT IT BUT I CAN'T FIND IT PLEASE HELP ME