The brother-in-law, who was dressed in the wrong size and was agitated by the nipple potch and the stepchild Rin who bites into the ass every day, finally exceeds the limit and attacks Rin. Rin, who began to be interested in sex, fell into pleasure while refusing, and crossed the forbidden line. In addition, he was attacked by his father-in-law and drowned in the pleasure of incest ...! !!