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anal anal_penetration blush bodily_fluids carrying_another comic cum cum_inside duo echidna eulipotyphlan european_hedgehog genital_fluids genitals hedgehog knuckles_the_echidna male male/male mammal monotreme onechan onomatopoeia penetration penis sega sex short-beaked_echidna sonic_the_hedgehog sonic_the_hedgehog_(series)sound_effects standing standing_sex text