Rule 34 Dev - anthro antidote balls biceps big_muscles biped bodily_fluids claws clothing cum erection eyewear genital_fluids genitals glasses hair horn human_to_feral male muscular muscular_anthro muscular_male nipples nude paws penis serum simple_background solo species_transformation transformation kuma human mammal rhinoceros 1:1 2013 hi_res|1653753360