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anal anal_masturbation anthro arched_back ass_up autorimming bent_over big_butt butt canid canine eyewear glasses half-closed_eyes hand_on_butt looking_down lyme-slyme male mammal masturbation narrowed_eyes non-euclidean_masturbation nude open_mouth oral oral_masturbation piercing pink_nose portal portal_(series)portal_autorimming portal_masturbation raised_tail shortstack shortstack_male simple_background solo tail teeth thinking_with_portals tongue tongue_out valve valve_corporation wide_hips