一日夫妻 Not One Day Married Yet
妖精真個換了，且暗喜道：「好和尚啊，果是個真人，一日夫妻未做，卻就有這般恩愛也。」那妖精喜喜歡歡的把唐僧親敬。妖精真个换了，且暗喜道：「好和尚啊，果是个真人，一日夫妻未做，却就有这般恩爱也。」那妖精喜喜欢欢的把唐僧亲敬。
逐句解 Line by line
The fiend actually made the exchange, and thought to herself with secret pleasure, "What a good monk he is! He really is a true man — we have not been husband and wife for a single day, and already he shows me this much affection."
Her delight is the cruellest thing in the chapter and the novel gives it to her straight. 真人 is a loaded word: in ordinary use it means a genuine, sincere person, but in Daoist writing it is a technical title for a Perfected One, an adept who has completed the work. She means the first. The narrator is allowing the second.
That fiend, in high delight, made much of the Tang Monk.
喜喜歡歡 is a doubled reduplication, the vernacular way of laying happiness on thickly, and 親敬 is to treat with affection and respect. Thirteen characters of a creature being happy, placed immediately before she bites.
This is the passage that makes the chapter more than a comedy. She is not gloating over a captive; she is touched that he was kind to her. The novel spends thirteen characters on her happiness and then kills her for it.
The word she chooses for him carries a meaning she does not intend. A true man in ordinary speech is simply a sincere one — but in the Daoist vocabulary this chapter has been swimming in since its title, a Perfected One is an adept who has finished the work and cannot be robbed of his vital essence. She has named exactly the thing that is about to defeat her.
And she was right about the affection, in a way. He did give her the better peach.