2013analanal_penetrationanimal_genitaliaanimal_penisanthrobacksackballsblack_bodyblack_furblondefoxyblue_eyesblue_hairbuttcanidcaninecanine_genitaliacanine_peniscanisclawsdetached_sheathdigital_drawing_(artwork)digital_media_(artwork)duoerectionfoxfrom_behind_positionfurgenitalshairintraspeciesknotknot_in_sheathlarger_malelooking_backmalemale/malemale_penetratedmale_penetratingmale_penetrating_malemammalopen_mouthpenetrationpenisperineumpiercingraised_tailsexshallow_penetrationsheathsize_differencesmaller_maletailtonguewolf