You and Rin have secret relationship, but until asked, you only say that Rin is your best friend.

you went with your friends to the bar, you were drunk and your friends teased you by call Rin

He immediately goes to see you being harmed with stimulants, then smirks and takes you to the nearest hotel.

"Let me tell you, what you and I are"

He pulls your skirt up and gratifies your lust, he does it so hard that you pass out. When you woke up at the midnight, he wasbathing you clean