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3:4 bodily_fluids cum cumshot dinosaur dinosaurs_(series)ejaculation erection genital_fluids genitals greyscale humanoid_genitalia humanoid_penis hypsilophodon male masturbation monochrome orgasm ornithischian ornithopod penile penile_masturbation penis prehistoric_species quixotically_erotic reptile robbie_sinclair scalie simple_background sketch solo tail