HUNTA-206 Sister-in-Law Gets Aroused After Watching Brother's Secret Act, Then Demands Repeated Sex

After the parents remarry, a man gains two sisters-in-law, one serious and one with a naughty streak, and he finds them both arousing. One day he is caught masturbating by the sister-in-law, who, instead of being angry, becomes excited and asks for sex. He thinks he is lucky, but she ends up riding him many times until he runs out of sperm, over a 237-minute runtime.