FURVERT!

2d_animation 4:3 animal_genitalia animal_penis animated animated_gif anthro anus asinus balls balls_expansion becoming_erect big_balls big_penis donkey equid equine equine_genitalia equine_penis expansion foreskin frame_by_frame genital_expansion genitals huge_balls huge_penis humanoid_genitalia humanoid_penis looking_at_viewer low-angle_view male mammal milkbreaks monochrome one_eye_closed penis penis_expansion sheath short_playtime smile solo thick_thighs uncut_with_sheath unsheathing wink