The overfriendly Xue Ren asked for more.
Of course, Milliane was a strong lady with really powerful bloodline that got honed by the battle and a lot of 'victims'. Her looks were also standing out from all the vermillion birds Xue Ren had seen, so it was normal for 'Sex God' to act in this way.
She also could help him much better with such bloodline! But knowing her and remembering how she had reacted to his little 'joke', Xue Ren was aware that this woman is not going to surrender herself easy.
The power, good bloodline and resources.
Milliane has a lot of and she still conquers. Her desire to reach the pure bloodline is simply immense! Thus, Xue Ren also could relate a little, so his attitude was even more friendly. He himself would aim to kill someone weaker if one spoke to him insolently.
The difference was that Xue Ren could speak a little more bold against her.