Shy stepsister seeks my help to lose her virginity and experience anal pleasure

My shy stepsister has always been a virgin, and she finally decides to break the cherry. I, being her only relative at home, am the only one she trusts to help her. She asks me to fuck her for the first time, and even though I\'m not exactly her type, I oblige. After a bit of coaxing, she lets me take her from behind and cum in her ass.