FURVERT!

animal_genitalia animal_penis asinus balls big_balls big_penis bodily_fluids brown_body brown_fur brown_hair donkey equid equine equine_genitalia equine_penis erection expansion fasttrack37d fur genital_expansion genital_fluids genitals green_eyes growth hair hi_res huge_penis hyper hyper_genitalia hyper_penis leaking long_penis male mammal muscular muscular_male nipples nude open_mouth pecs penis penis_expansion precum sitting snout snout_grab snout_growth solo story story_at_source story_in_description tail thick_penis transformation vein