My girlfriend, who I live with, is wearing a chastity belt because she suspects me of cheating on her. One day, my girlfriend's older sister Rin comes to live with us for a week because she can't sleep due to construction noise... I happened to see Rin after taking a bath and I couldn't help but get an erection! Her chastity belt was discovered by her older sister Rin. Just for fun, I played with her chastity belt... That's how the little devil sister Rin's one week of titty fuck ejaculation management begins! "Please lend me your breasts, sister. I can't hold back anymore!"