In the dim light of the study, grandpa's gnarled fingers trace the outline of his granddaughter's lips on an old photograph. His mind drifts to her luscious young mouth, and his hardening cock tents his pants. He strokes himself, fantasizing about her innocent face pressed against his crotch, her tongue eagerly exploring his wrinkled balls, his veiny shaft. His strokes quicken as he imagines her taking him deep, her inexperienced throat gagging on his length. Lost in his filthy daydream, he doesn't hear her enter. Caught in the act, he turns, his eyes wild, his mouth wet with spit and lust. She watches, frozen, as he resumes his frenzied masturbation, his old body convulsing as he spills his seed onto the worn rug.