rule 34 arched back athletic black claws black markings bodily fluids brown pillow canid canine canis claws colorful cum cum stain curl domestic ejaculation feral genital fluids grabbing sheets gradient background green eyes hi res humping jenklin character kangal knot kodaac livestock guardian male mammal markings masturbation molosser mountain pastoral pawpads pillow pink body pink pawpads pink skin pussy ejaculation pussy juice realistic saliva saliva string shaded simple background slightly solo spots spotted markings tongue tongue out white body 7644989