He discovers that his sister is a prostitute and he fucks her for money
He would never have imagined that his sister was a prostitute, especially since she was also married. Being as horny as he was, it occurred to him to call a whore to have a good fuck at the motel where he was staying, but when his sister showed up by surprise, he was shocked. They both talked and she explained that she was a prostitute, but that no one knew. He obviously did it to make money.
The boy began to get more and more horny and proposed to have sex. She told him no, but that he could masturbate looking at her in exchange for money. You can imagine that as usual he wasn’t satisfied with just that, after a while he wanted to penetrate her. She demanded more money in exchange for the penetration, in addition to promising that she would not say anything to anyone and that it would end soon.
He didn’t keep any of his promises, but yes, at least he fucked his whore sister.