She should tell him to be wary of so open ended a promise....later.

"I will be glad to show you how to please me." And the thought of him doing that is enough to excite her all by itself.

"Feel free to move however you need to in order to see better." She opens her legs as wide as she can, giving Skellig a view of anatomy he might not have seen before. She uses her fingers to spread her folds apart, to let him see her most sensitive places. "This right here," she rubs her clit, makes a small moan of pleasure. "Is a little like your cock. Feels very good when it is touched, rubbed."