Despite wishing for it to end, Yukina continues her schoolgirl prostitution at the wishes of her uncle, but she quickly finds out none of her clients are as good, or as big, as he is. Looking for someone who can fulfill her desires, she sets her eyes on her swimming coach, noticing the giant bulge he had during class. With a penis twice as big as her boyfriend's, this man can please her just as she wanted, but her dark secret is going to be hard to hide when she finds out he doesn't care at all if they get caught.