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1:2 animal_genitalia anthro anthro_on_anthro asinus balls barbell_piercing bdsm carrying_another dominant dominant_male donkey duo equid equine genitals hi_res horse katthekitkat larger_male male male/male mammal master muscular muscular_anthro muscular_male muscular_sub nipple_barbell nipple_fetish nipple_piercing nipple_play nipples penis penis_tip petplay piercing piggyback ponyplay roleplay sheath size_difference slave smaller_male submissive submissive_male