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1:1 anal anal_penetration anthro anthro_penetrating anthro_penetrating_human anthro_top belly biped bowser dominant duo human human_on_anthro human_penetrated interspecies koopa larger_anthro larger_dom larger_male low_res male male/male male_penetrated male_penetrating male_penetrating_male mammal mario_bros monochrome muscular muscular_anthro muscular_male nintendo penetration scalie sex size_difference smaller_human smaller_male smaller_penetrated unknown_artist