rule 34 1boy agent artist anthro balls barefoot bedroom eyes bottomless choo choo top cat clothed clothing covering covering crotch cute fangs erection erection under clothes feline front view greyscale half closed eyes looking at viewer male male only mammal monochrome naughty face pencil artwork pinup pose seductive signature sitting solo spread legs spreading sweater tongue tongue out top cat series traditional media artwork turtleneck wet spot whiskers 2071782