Uke (blonde hair), who is a top, is going to bars trying to form contracts with cute little bottoms. He is a sadist top who likes masochist bottoms. Seme saw his appearance at a bar and went up to him to like to form a contract with uke. Seme told uke he was a bottom and would like to try out with uke. Uke agreed and they went ahead to a hotel.
Basically, uke got tricked into being a bottom
Ore no Sekai o Hakai Suru Otoko