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2016 animal_genitalia animal_penis anthro aogami balls becoming_erect bodily_fluids canine_genitalia canine_penis cum cumshot ejaculation erection faceless_character faceless_male fully_sheathed genital_fluids genital_shot genitals half-erect hi_res knot knot_in_sheath male mammal orgasm penis penis_shot progression sheath simple_background solo white_background y_sheath_opening