FURVERT!

2012 all_fours anatomically_correct anatomically_correct_genitalia anatomically_correct_penis animal_genitalia animal_penis anthro arched_back balls bedroom_eyes biped dark_natasha digitigrade erection genitals greyscale half-closed_eyes holding_tail looking_at_viewer lying male mammal monochrome murid murine narrowed_eyes naughty_face penis rat rodent rodent_penis seductive side_view signature sketch smile solo tail whiskers