Rule 34 Dev - 2016 abs absurd_res animal_genitalia anthro armpits athletic balls biceps big_biceps big_muscles big_penis duo erection fur hair hi_res humanoid_penis male mammal manly muscular muscular_male mustelid nexus nipples nude open_mouth otter pecs penis sex sieg simple_background size_difference smile teeth tongue vein veiny_penis yaoi|2378566888