I'm thinking that Lucilla, Graccus, and Quintus work together to restore the republic. Quintus calls some of the Felix legions and gains the soldiers loyalty through bribery and saying he helped Maximus kill Commodus (didn't give Commodus a sword) they lock down Rome and don't allow anyone in or out. What would happen to Lucius, maybe Graccus could take him under his wing. Maybe he rises to consul in the new republic.
Come on people, this could be really fucking cool. Just throw anything you can think of out there.