The wife is riding the strangers cock hard. He does power it from the bottom, but she also bounces hard up and down. She pants a bit and the guy has a good hold on her tits. He grabs her ass and the riding position changes ever so slightly. This leads to the beginning of the wife’s orgasm at 1:35. At 1:43 she is really noisy and her orgasm lasts a good while with an “oh my god”. She turns red and lays down on the guy who continues to fuck her. At the end of the video is a brief flash of the husband who had cum while filming this. It’s safe to assume that he got off watching his wife cum on the stranger’s dick.