FURVERT!

abs animal_genitalia animal_penis anthro anus backsack balls biceps big_penis biped blonde_hair brown_body brown_fur butt dock_(anatomy)equid equine equine_genitalia equine_penis erection flared_penis fur genitals hair horse legs_up looking_at_viewer lying male mammal muscular muscular_anthro muscular_male nipples nude on_back open_mouth pecs penis perineum pink_eyes pose presenting presenting_hindquarters puffy_anus raised_tail ronin-nc solo spread_legs spreading tail tongue vein