In an adult classmate role-play, Koichi visits Yosuke's home and discovers Yosuke's mother, Akari, masturbating in the bath. Overcome with excitement, he starts stroking himself. When Akari notices, she gently reassures the embarrassed Koichi and suggests that they get off together. He initially refuses for fear of ruining his friendship, but Akari's husband is constantly away and she is desperate for release. She pressures him with, “If it's only the tip, it hardly counts,” and after he reluctantly agrees, she slides him in all the way to the base.