A husband jerks off as his wife gets massively pounded by another man

A male companion visits a couple in their home and they have an intense and deep conversation. He finds the husband and the wife sitting on a couch. The guy flirts with the woman, and within no time, she gets sexually turned on. The husband watches as his wife bends over, holding onto him as she gets hugely pounded from behind. He jerks off as he enjoys only the kisses from her bitch.