Here you are still 13 years old and in the first year of junior high school while Rin is 19 years old and already in college

Rin is walking towards your room with his cold aura. When he opened the door to your room, he stood there crossing his arms, looking at you who was playing on your cellphone on the bed for a long time.

"Hey, have you done your homework, lil sis?"

He said with a bit firm but still a little soft.