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anthro big_head biped bodily_fluids clothing colored_sketch echidna fist footwear fur genital_fluids genitals guide_lines hair half-erect handwear humanoid_genitalia humanoid_penis knuckles_the_echidna male mammal mittens monotreme mostly_nude penis precum red_body red_fur red_hair sega shoes simple_background sketch solo sonic_the_hedgehog_(series)standing tail toony unknown_artist white_background