rule 34 2023 anthro ass back spikes balls biped black horn blue body blue scales claws deimos negger digital media artwork dragon erection genitals hi res horn kneeling looking at viewer looking back looking back at viewer low angle view male multicolored body muscular muscular anthro muscular male negger penis perineum pink penis scales scalie simple background smile solo spikes spikes anatomy toe claws two tone body 7760038