abdominal_bulge abs anal anal_penetration animal_genitalia animal_penis anthro anus arm_grab backsack balls biceps butt canine canine_penis clenched_teeth cum cum_inside cum_splatter cumshot drooling ejaculation equine equine_penis erection eye_roll fox fur hair hands-free horse knot lifted male male/male mammal muscular orgasm penetration penis saliva sex size_difference sound_effects tears teeth toe_curl tush vein