"Recently, your son Yutaro's penis has been getting hard in the morning..." Eri, a worried mother, consults him and looks into his room the next morning. There, she finds his magnificent morning erection pushing up the futon. When he wakes up and is depressed, thinking he might be sick, Eri says, "This is a sign of good health. Mommy will help you get all that's been building up inside you." She runs her tongue over his rock-hard penis, takes his swollen sack into her mouth, and begins to suck out what's been building up inside him...