[Wanda expects that smile to slip away but it doesn't mean that she's going to let it happen so easily.]

I know it's not as much as I promised yet but I am trying to keep from giving you a heart attack.

[She may be playing off his lack of smile as disappointment that she isn't offering more, even if she knows better. Grabbing a bottle of shampoo, she rises up onto her knees as she shifts her position to settle down between his knees. It puts her close to him without being pressed up between his legs or against his body, which hopefully will give him a chance to get used to it. She drops a little of the liquid into her hand, sets the bottle aside, and lathers it up.]

Besides, if you've never had someone wash your hair for you, you're in for a treat.