What I always had in front of me was my black butt... I live with my girlfriend and her younger sister. My younger sister is a gal and doesn't wear a skirt at home and always wears a thong. Are you not aware of me as a man? I can't maintain my rationality as my sister, who is thrustting her black ass out and walking around the house... With a fully erection, I moved my thong and inserted it from behind. Having lost my sanity, I forgot to put on a condom and continued to shake my hips until I cum inside her.