In an adult classmates role-play, Koichi visits his friend Yosuke's house and discovers Yosuke's mother, Akari, masturbating in the bath. Overcome with excitement, he starts stroking himself, and when Akari notices, she gently calms his embarrassment before suggesting they get off together. Koichi refuses at first, afraid of ruining his friendship, but with her husband constantly away and her frustration mounting, Akari pushes her tempting excuse: “If it's only the tip, it hardly counts.” He reluctantly gives in, and she ends up taking the whole shaft.