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4:5 absurd_res anal anal_penetration animal_genitalia anthro balls being_watched canid canine casualties:_unknown dildo dildo_in_ass dildo_insertion dildo_sitting expie_(gunsawian)fox genitals gunsawian hi_res hybrid laboratory looking_at_another lube lube_bottle male mammal mechanical_arm murid murine object_in_ass omniferret penetration penis penis_tip rat rodent sex_toy sex_toy_in_ass sex_toy_insertion sheath test_subject