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6:5 anal animal_humanoid anthro aquatic aquatic_humanoid cephalopod cephalopod_humanoid clothing coleoid decapodiform duo feral fin fish from_behind_position hi_res humanoid humanoid_on_anthro inkling inkling_(squid_form)lying male male/male mollusk mollusk_humanoid monochrome nintendo on_front overalls sakamata salmonid_(splatoon)sex size_difference splatoon steelhead straps teeth tongue tongue_out