Caution: This Fiction Sex Story contains strong sexual content, including Ma/Fa, Consensual, Heterosexual, Fan Fiction, Cheating, Incest, Brother, Sister, Masturbation, BBW,
Fiction Sex Story: I have a marriage on the rocks, and a sister who does porn. After my wife cheated on me many times, my sister told me straight out that I could fuck her any time I wanted. I didn't want to be unfaithful to my wife, no matter what she had done. But my sister is so gorgeous. What's a big brother to do?