Toria fell into step just one step behind Jaehaerys. Incognito or not, he was still the heir to the throne. However, in this case, it could easily be perceived as him leading the way.
"Have you had dinner yet?" she inquired. "If not, I'd be happy to treat you to something. Lannisters take care of their friends and allies."
After all, if he was working as a sailor in order to keep up his act, it was entirely possible that he hadn't had the chance to eat yet. And Lannisters did take care of people they counted as kin, friends and allies. Lannisters paid their debts.
As they walked toward their desination and reached it, she noticed Ser Geron suddenly looking mildly uncomfortable. It was too dark to tell whether or not he was blushing.