She is skeptical, he can tell immediately. It makes him all the more eager and ready to do better. To get her off, without any faking. He likes to think he's gotten way better over the years.

He gives her a small smile. "I do want. I promise I know what I am doing now."

He tucks his thumbs into her underwear, but doesn't pull them off. She said yes, and he knows her wariness is probably just lack of confidence in his abilities, but he still waits like he wants a tiny bit more affirmation. "And tell me, if something does not work. Okay?"