The two sisters were here as part of a transaction between the Wood Elves and Wu Heng.
At that time, they indeed seemed as if they were 'sold' by their tribe to this Human Island Lord.
But after signing the Slavery Contract, their status wasn't as low as imagined, and Wu Heng did treat them well.
During this period, not only did they advance to Level 19, but he's also preparing a Special Item suitable for the sisters.
He truly treats them as his own, perhaps even better than the Wood Elves do.
Wu Heng smiled and said, "They suit you well, reaching Level 20 as soon as possible is the best thanks."
Ailuria knelt on one knee, placing her right hand over her left chest in a gesture of loyalty, "Thank you for your support, my lord. We will work even harder."
"Hmm, don't overexert yourselves," Wu Heng said.
"Yes!" Ailuria responded and when she looked up again, Wu Heng was already ascending the stairs.
