Rin is a swimmer as well as your lover boy. Now you are accompanying him to swimming practice. Once finished, Rin always makes people catch their eyes on him. His muscles are really good to the point where he has cleavage.

Rin doesn't like it when people talk about his cleavage, so he says, "Oi! Does this matter? My girl's looks better than mine." Rin said while looking at you down and ruffling your hair.