Fics like Natural Selection: Nana Knows Best

Deborah Peters loves her son Sam very much, despite - or perhaps in part because of - his massive swinging cock and insanely voluminous ejaculations. She's managed to keep this a secret from everyone other than Sam's doctor for months now, but after such a long time her mother Cynthia is fed up with waiting to see her only grandson. The domineering matriarch finally overrides Deborah's resistance and demands she let Sam come stay with her for a week. Sam and his mother are both concerned about how he's going to manage to keep his HUGE secret from his Nana for an entire week when he can't even go a few hours without blasting enormous loads of cum, but Deborah feels as if she has no choice. That's how Sam finds himself staying over at his Nana's house. Though she is often gruff with his mommy, his Nana is nothing but sweet, loving, and affectionate with him. Sam is about to learn just how deep his Nana's affection for him runs, and Cynthia can hardly wait to demonstrate just how few limits there are to the things she'll do for her adorable grandson.

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