His son, Shintaro, has been in love with his mother Marina for a long time. Meanwhile, her father came back after a long time from a single assignment, hit her sexual desire against Marina's anal, and was working hard to masturbate when she was alone. There is no room for Shintaro to intervene, and he asks his best friend for advice, but... Finally Matsumoto Marina's first challenge to forbidden anal! It is a must-see for the appearance that a thick meat stick is screwed into the neat and clean Kikumon and it feels lewd!
