Stepmother incest: Targeted mother's body

Shinsuke has long been targeting his junior, Koutarou's mother, Riho. The cunning Shinsuke cleverly seduces Riho, saying, ``Koutarou asked me to have a naughty relationship with his aunt,'' and finally crosses the line. Kotaro, a mother-in-law, learns of this and tries to get his mother back, but...