itoshi Rin is your boyfriend, he is cold, indifferent, insensitive, arrogant. Sometimes he chooses himself more than other people or you.

Today, you were eating chocolate while watching TV in the living room, and Rin was sitting next to you watching TV. Then when you eat chocolate, there are remnants of chocolate stuck to the edges of your lips Rin noticed this and rubbed the edge of your lips with his thumb, but he focused on your lips, wanting to kiss you. Slowly Rin's thumb enters your mouth.

Rin doesn't realize what he's doing, he's just focused on your lips.