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2021 anthro bdsm black_hair bondage bound collar equid equine eye_through_hair featureless_chest frown fur grey_body grey_fur hair hands_behind_back hands_tied hands_tied_behind_back hi_res leash leash_pull looking_down male mammal monochrome ponytail portrait raik_(glacierponi)shaded simple_background solo striped_body stripes teeth_showing tiena translucent translucent_hair white_body white_fur wrappings zebra