YSN-397 My Younger Sister, Who Is About To Get Married, Accidentally Saw Me Masturbating As Usual, Which Made Me Shake Up. She Looked At Me Kindly And Said, "You Can Only Do This Before You Get Married, So If You Want, I'll Help You Out." She Used Her Perverted Techniques To Tease Me To The Max, And I Got A Rock-hard Erection.