FURVERT!

abs animal_genitalia animal_penis anthro big_penis canid canine canine_genitalia canine_penis canis claws collar domestic_dog erection fangs genitals hi_res holding_penis knot looking_at_viewer male mammal masturbation muscular muscular_anthro muscular_male nude penile penile_masturbation penis pit_bull simple_background smile solo source_request spiked_collar spikes tail teeth unknown_artist vein white_background