rule 34 2021 abs anthro ass back muscles balls bodily fluids burrserk claws dinosaur dripping flaccid foreskin front view genital fluids genitals half erect hi res humanoid genitalia humanoid penis looking at viewer looking back maku burrserk male model sheet multiple images muscular muscular anthro muscular male navel nipples nude obliques open mouth pecs penis precum precum drip rear view red eyes reptile scalie simple background smile solo theropod tongue tongue out tyrannosaurid tyrannosaurus tyrannosaurus rex vein veiny penis 5363835