Mika (Hotaru Mori) is a mother who supports her son and his friend Hotta, who is about to take an entrance exam. One day, Mika and Hotta approach her, promising that it will only happen once, and they end up having a physical relationship. Hotta can't stop thinking about Mika, who has a great body and is kind to him. He can't forget the passionate kiss they shared that day, the intense blowjob, and the feeling of his vagina when he penetrated her raw, so he breaks his promise to Mika to do it just once. But Mika accepts Hotta as a private tutor... They lick each other's crotches, covered in saliva as if they're greedily eating each other's food, and Mika straddles him, shaking her breasts with all her heart. And finally, she encourages him to ejaculate into her vagina...