A DIRTY BOY INDEED: A taboo and dirty romantic erotica sex story

A hot young guy with a strong sex drive named Billy is the subject of this romantic-erotic tale. He had always wanted to make out with his horny step-sister Daniella and have a threesome with Kate, his girlfriend. Without Daniella realizing it, he fucks her. But he subsequently purposefully fucks her during a massage session. His girlfriend Kate discovers him some months later with a woman she had no idea was his boyfriend's stepsister, Daniella. Daniella and Kate got into a sexual argument before joining Billy in a threesome.