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animal_genitalia bodily_fluids bovid bovine breast_milking bucket cattle container duo erection female feral flaccid genitals in_bucket in_container lactating lagomorph leporid machine male mammal masturbating_with_milking_machine masturbation milking_machine penile penile_masturbation penis penis_milking rabbit sen_grisane_(artist)sheath size_difference suction_cup tail tail_tuft teats tongue tongue_out tuft udder_milking udders