Failure As an Uncle

A 29-year-old office worker is in love with his stepsister's husband.

One day, his nephew walks in on him doing anal masturbation, and things take a naughty turn. His nephew reminds him of his brother-in-law, and, unable to contain his curiosity, he lets him put it in his ass. He knows he should be lecturing his nephew, but he's hardly in any position to talk, with his raw dick in his ass. Realizing his true desires, he gives into pleasure…

(Source: Renta!)