rule 34 2011 abs anthro athletic biceps black body black fur black nose bodily fluids bottom pov brown background brown body brown eyes brown fur canid canine canis digital media artwork dobermann domestic erection first person view fur genital fluids genital focus glans holding penis humanoid penis ksharra leaking looking at viewer low angle view male male only mammal masturbation muscular nude pecs penis penis towards viewer pink glans pinscher pose precum presenting signature simple background smile solo standing 3426400