Skellig nearly says there is no need for want, when it is what you already have but part of him does truly appreciate feeling wanted and desired, as it is a feeling that he is unaccustomed to and one that he finds he enjoys. Especially from Kreyu.

"I am yours," he says firmly, voice reassuring. "And you are mine. And it is with my mate that I will stay. I will not stray from you, no matter the temptation..."

(Nevermind that Kreyu would likely swiftly put an end anyone who tried to steal him from her.)

"...you are all that my soul desires."