He went crazy with her huge tits
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He cannot imagine what led his brother to make the decision to adopt celibacy. Surely, he was alienated by some sect or got into that trend of new ideologies that only end up screwing people over. The truth is his sister-in-law is hot and loves to fuck, something that someone has to do. He can’t bear the thought of another man coming home to screw her, so, being her brother-in-law, he has to pull out his dick to make her enjoy it. And that’s what any normal, everyday man would do because family comes first.