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anthro anus backsack balls buckteeth butt dialogue eyewear eyewear_only genitals hi_res humanoid_genitalia humanoid_penis lying male male_anthro mammal monochrome murid murine nude on_front penis penis_backwards perineum presenting presenting_hindquarters raised_tail rat rear_view rodent seductive sion_the_rat sketch solo sunglasses sunglasses_only tail tail_anus teeth trmk2