Worried about her cherry boy stepson, stepmother Ayumi begins helping him with masturbation due to his insecurities and her own sense of responsibility. There's a reason behind his name, Kaoru—once he experiences a woman for the first time, Ayumi finds herself increasingly drawn to him, though she strives to keep things from going too far. However, realizing true comfort lies in embracing her maternal role, she makes the choice to take his virginity—just this once, she tells herself. Recorded with digimoe.