Go ahead and post now... I'm up to my elbows in homework so I'm not able to sit down and think out a post for Gaius yet... hehe. 
I suppose that anything is feasible once Tressa gets free... I'd think it would be better for her to belong to an NPC family, though, so that our characters don't have to die to grant her freedom. Simply because all of our characters are headstrong Romans who would not intentionally free a slave--especially not one with Tressa's erm... "talents." So I'd say an NPC family might be best... Up to you though.