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anthro anthro_on_anthro big_butt butt canid canine casualties:_unknown duo expie_(gunsawian)face_in_ass facesitting femboy fox grey_background greyscale gunsawian heart_symbol hi_res huge_butt hybrid intraspecies looking_pleasured lying male male/male male_anthro mammal monochrome murid murine nude_anthro nude_male on_back rat rear_view rodent sex simple_background sitting sitting_on_another smothering thick_thighs unsigned vamux_(artist)wide_hips