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1:1 anthro avian big_breasts big_butt bird bodily_fluids breasts butt butt_cleavage cellulite dominant dominant_female duo eulipotyphlan facesitting female hedgehog hi_res hirundinid huge_butt larger_female male male/female mammal oscine passerine sega shadow_the_hedgehog sitting sitting_on_another size_difference smaller_male smothering sonic_riders sonic_the_hedgehog_(series)swallow_(bird)sweat ultimateshadow wave_the_swallow y_shaped_butt_crack