His Virgin Sister (PI Family Erotica, Taboo, First Time)
Chris Houston is home from college, and is woken up in the middle of the night by his parents having sex. Horny, he runs into his newly-eighteen year old adopted sister, Ev, and she ends up in his room, begging for him to take her virginity. He has always thought it was wrong to find her attractive; after all, she is still his sister. Regardless, he can't resist her, and fulfills her wishes.