Your older sister Kendall is sunbathing on her stomach by the pool without her bikini top on. You stare at her through the window and start jerking off to the sight of her amazing ass. As you get more horny you get more desperate, you decide to go up te her without her seeing you and jerk off right next to her to her ass, since your parents are gone. Suddenly you cum all over her back and ass, and Kendall wakes up. Kendall “huh wtf is this, did you just cum on me, wtf is wrong with you this is so fucked”