Mari Kikukawa, Chisato Shoda, Shinobu Oshima, and Ikumi Kondo: This is a four-episode work starring four whip-smacking girls. A MILF comes home and is taken care of by her boy, who is in his underwear. She masturbates, and he saw it. The wife gets an erection and crosses the line with him, who she fucks in a stupor.