A son is troubled by his inability to retract his foreskin, but his secret is discovered by his mother, Kaede, whom he secretly has feelings for. Worried about her son, the kind Kaede offers to help by performing the procedure to retract the foreskin. However, the son's penis feels so good under his mother's warm hands that he ejaculates multiple times. After much effort, the foreskin finally retracts, but his lust awakens and he attacks his mother! "Just retracting it won't satisfy me!" He sheds his foreskin and transforms into an adult penis...