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anthro anus bodily_fluids border_collie breasts canid canine canis clothed clothing collie domestic_dog female fingering fingering_self flannel fur genital_fluids genitals herding_dog hi_res humanoid_genitalia humanoid_vulva lf mammal masturbation nude partially_clothed pastoral_dog presenting presenting_vulva sarah_(wheresmysocks)sheepdog sitting sketch solo spreading vaginal vaginal_fingering vaginal_fluids vulva