FURVERT!

4:3 animal_genitalia animal_penis anthro anus ass_up balls bdsm big_butt bondage bound butt elbestia equid equine equine_genitalia equine_penis gag gagged genitals hooves horse male mammal muscular muscular_bottom muscular_male muscular_sub nude penis penis_backwards presenting presenting_anus presenting_hindquarters raised_tail solo submissive submissive_male tail thick_thighs