The so-called irresistibility of the marrow's taste, Ning Fan and Xu Ruolan both had this feeling, especially since they were respectively the Pure Yang Body and the Pure Yin Body, the otherworldly experience of that night made both of them a bit restless.
Especially Ning Fan, because Xu Ruolan possessed the Pure Yin Body, coupling with her did not count as a breach of his cultivation but rather brought him several benefits. After indulging for the first time, it became somewhat difficult to enter Sage Mode.
Of course, neither of them were controlled by desires, and as newcomers to intimate relations, Ning Fan certainly wouldn't forcefully take what was not given; after work, upon returning home with Xu Ruolan, Ning Fan was exceedingly caring, and Xu Ruolan's face grew increasingly joyful.