SSIS-502 Two Days Alone With My Sister's Ideal Big Butt: Licking and Playing With Kasumi Riko

The narrator's sister is away for two days, leaving him alone with her younger sister, Riko. He forcibly licks her ass, and although she resists at first, she gradually responds to his tongue and intense thrusting, climaxing repeatedly. They have sex in the living room, bathroom, and her room, and he wonders if she will tell her sister about their secret.