Rule 34 Dev - 2021 abs abstract_background anthro barazoku bent_leg biceps big_bulge big_muscles big_nipples braided_tail bulge clothed clothing cybernetic_arm cybernetic_limb cybernetics equid equine erection erection_under_clothing eyebrows flexing grey_background grumpyfloof hair hi_res horse huge_bulge huge_muscles long_hair looking_at_viewer machine male male_only mammal muscular muscular_anthro muscular_male navel nipples obliques pecs simple_background sitting smile solo tattoo tenting text thong underwear url|6123082328