Rule 34 Dev - 2015 abs all_fours anal anal_sex anthro back backdraft balls bandage biceps blue_eyes blue_fur canine doggy_style duo equine erection eyebrow_piercing facial_piercing from_behind fur green_eyes grey_fur grey_hair hair hooves horse humanoid_penis interspecies kneeling male mammal muscular nipples nude pecs penetration penis piercing sex twinkle-sez white_fur yaoi|2103474768