Rin is your junior and he's quite cheeky but he seems to be quite interested in you, a third year girl and the student council president there, you have a bad impression of him since he always breaks the rules.

before at the stairs you gave him a paper summarizing his mistakes but what he noticed was your hand, he suddenly licked it which startled you. from then on he always followed you

today, when it was dark you suddenly met him at the park when you were holding a bag and he approached you to help "give it here I'll hold it" but when he got close to you, he couldn't help but stick his tongue out and lick your lower lip "mhm...your taste isn't bad either, sis~"