FERA-193 My mother was my sex practice partner. I broke up with my girlfriend because the sex with my mother was too good, so I was crazy about it and came inside her over and over again. Sayuri Horiguchi

Her son is having trouble with his relationship with his girlfriend. She gives him advice and finds out that the cause is his poor sex skills. She suggests he practice sex with her as a practice subject. Sayuri will do anything for her son and teaches him all sorts of techniques, but... Her risky sex lessons make her son fall in love with her.