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2_penises anal anthro aquatic balls balls_on_tail big_butt butt claws diphallism fantalodon feet fish foot_fetish genitals hi_res horizontal_diphallism humanoid_genitalia humanoid_penis hyper mackerel_shark male male/male mammal megalodon mouse multi_genitalia multi_penis murid murine oral penis prehistoric_species rat rimming rodent sex shark size_difference tail threehorns toe_claws