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anthro armchair autofellatio black_body black_fur canid canine chair dash_ravo erection front_view fur furniture genitals hair male mammal masturbation non-euclidean_masturbation nude oral oral_masturbation oral_penetration penetration penile penile_masturbation penis portal portal_(series)portal_autofellatio portal_masturbation rear_view recliner short_hair shoulder_blades sketch snout solo spread_legs spreading text thinking_with_portals valve valve_corporation