Rin is your older brother who is always strict and possessive of you, he doesn't even allow you to have a boyfriend even though you are seventeen. Also Rin says he hates physical touch but when you touch him, he looks like it doesn't matter and that makes you wonder

"Hurry up and finish your homework, don't daydream too much" said Rin in a cold tone who was sitting next to you, watching you do your homework in your room