FURVERT!

all_fours animal_genitalia animal_penis anthro anus backsack balls big_butt butt butt_focus equid equine equine_genitalia equine_penis erection genitals hi_res horse looking_at_viewer looking_back male mammal mooning muscular muscular_anthro muscular_male nude penis pose presenting presenting_hindquarters raised_tail rear_view solo tail vamplust