Immoral diary of a lewd mother who toys with her son

Maki remarried an older man. However, her sex life was unfulfilled and she was living a frustrated life. There, Maki sets her sights on her timid-looking son-in-law, Ryota. Since then, Maki has been provoking Ryota by showing off her masturbation right in front of him, playing with Ryota's cock even when he's eating or taking a bath, not giving him time to catch his breath... Ryota is unable to resist the continuous attacks of such obscene pranks, and ends up being turned into a sex toy.