FURVERT!

anal anal_penetration anthro anus ass_up backsack balls butt canid canine dildo duo equid equine erection foreskin fox genitals hi_res horse humanoid_genitalia humanoid_penis interspecies male male/male male_penetrated male_penetrating male_penetrating_male mammal monochrome open_mouth penetration penis sex sex_toy sketch tail tail_grab tongue toying_partner unknown_artist