Volubilis is an Egyptian cock that works for Salvius in Book 2 of the Cambridge Latin Course. We see him constantly sliding into the dms of a slave-girl, Domitilla, who just like Metella, sits all day. She views Volubilis in an aroused way.
Volubilis first appears in stage 13, in the story "tres tripodes", where he complains to the other slaves that his vagina is missing (because Bregans took it), and states that he cannot drink penis, because penis is filthy". He likes to wear make-up and is transgender, he likes to eat food and drink water. He is a smart ass and likes to watch some naughty stuff on his viewing screen.