Rule 34 Dev - anthro bag big_bulge big_butt big_muscles bubble_butt bulge butt clothed clothing flexing fur grey_body grey_fur grin hooves jockstrap jockstrap_only locker locker_bench locker_room male mostly_nude muscular muscular_anthro muscular_male smile solo teeth topless underwear underwear_only dioni5 bucephalus equid equine horse mammal hi_res|17384319435