As the Twelfth Palace Master's snow-white garment slid down, Seth felt completely lost and out of words. He was a man that was always ready for anything, but what Lan Xue had just done, caught him off guard and proved that there were things that were impossible to be expected.
The shock he felt was so intense, that his "instinctive beast mode", the one Lexi often referred as "pervert mode", hadn't even turned on, even though there was a naked lady right before his eyes. Actually, if she was one of his women, Seth would have already pounced on her, at the very second that she took her clothes off. However, he couldn't do that with Lan Xue; not at that time and place.
Inside Seth's head, Meiyi's image was constantly floating, blocking him from thinking about doing those things with someone. Even if that person were to be Arwen, Seth didn't think he could actually do it, much less with someone that wasn't even his woman.