FURVERT!

abs animal_genitalia animal_penis anthro biceps big_penis biped boxer_briefs clothed clothing draft_horse equid equine equine_genitalia equine_penis erection fur genitals hair hi_res horse male mammal masturbation muscular muscular_anthro muscular_male pecs penile penile_masturbation penis penis_poking_out penis_through_fly pose presenting simple_background sketch solo standing tail thick_penis topless tush_(artist)underwear vein