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2020 alex_(spikedmauler)anthro arched_back athletic athletic_anthro athletic_male blonde_hair erection fur genitals grey_background grey_body grey_fur hair hands_behind_head hi_res humanoid_genitalia humanoid_penis long_hair male mammal mouse murid murine navel nude penis pose red_eyes rodent saucymauler side_view simple_background sketch solo standing vein