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against_surface alpha_channel anthro ass_on_glass bent_over big_butt bubble_butt butt butt_focus echidna fangs femboy glass icon knuckles_the_echidna looking_back male mammal monotreme on_glass on_surface open_mouth presenting presenting_hindquarters purple_eyes rear_view sega simple_background solo sonic_the_hedgehog_(series)squish_(artist)teeth transparent_background