Movie wise, no, he's just reminded, she herself came to him multiple times like during the war speech, sending letter when she's about to die and whatnot
but easy solution : He is "sprinting" in the plains (why not)
And find a destroyed caravan, and a hidden surviving slave.
So he basically he let her follow him to city, but city/receptionist-girl basically tell him the best solution is him "becoming the master", if not she will taken back (and likely get bad master)
Say he doesnt understand everything and is not sure
but because she trust receptionist girl (thx to his innocent personality and with his usual "luck" made him encounter a trustable person among receptionists)
he accept the proposition
and basically is carried by the flow, totally not following the process of slave-master-thing ritual and signing papers without understanding them.
And IMMEDIATELY AFTER, without reading the delicate awkward mood (of the slave girl not sure what they gonna do next), densely ask her to follow him to continue his jogging (plains).