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4:3 animal_genitalia animal_penis animated animated_gif anus backsack balls becoming_erect big_balls big_penis blush bodily_fluids canid canine_genitalia canine_penis clitoris cum cum_while_transforming cumshot eevee ejaculation erection expansion female feral fth_transformation fti_transformation gender_transformation generation_1_pokemon genital_expansion genital_fluids genital_growth genitals growth hands-free herm huge_balls huge_penis hyper hyper_genitalia hyper_penis intersex jeygisdragus knot long_penis low_res mammal neck_tuft nintendo orgasm orgasm_face penis penis_growth pokemon pokemon_(species)short_playtime signature small_but_hung solo spontaneous_ejaculation spontaneous_erection sweat thick_penis tongue tongue_out transformation tuft vaginal_fluids vaginal_squirting vein veiny_penis vulva_expansion