How cool she was bouncing on his penis! The man just about lost his mind from such an incredible thing, and I would not have refused to fuck such a beautiful tattooed chick myself. This sex was everything: and fingering, and excellent jerk off with a beautiful blow job with swallowing, well, just a wonderful vaginal sex, which gave the couple an opportunity to relax after a hard day)
And why the girlfriend was so turned on - he was her half-brother, not her own. And who's gonna train his sister, a stranger's uncle? No, only your own should be trusted with her pussy.