FURVERT!

animal_genitalia animal_penis anus big_penis claws erection eupelycosaur fangs feral genitals gorgonopsid inostrancevia looking_at_viewer looking_back looking_back_at_viewer male open_mouth penis prehistoric_species quadruped rear_view solo soukosouji synapsid tail teeth therapsid tongue tongue_out unusual_anatomy unusual_genitalia unusual_penis