After I get my first girlfriend but prove too shy even to kiss her properly, my adult childhood friend Rin offers to let me practice on her. We move from light kisses to deep tongue kissing, and the chemistry between her soft lips and entwining tongue becomes addictive. Day after day, we practice until strands of saliva hang between our mouths. Unable to stop at kissing, I push for sex practice too, and we end up sleeping together. Things become awkward afterward, but neither of us can forget how the other's kiss felt.