Tell her she's sexy
From Create Your Own Story
“I’m sorry if this makes you feel uncomfortable, but you’re very sexy."
She stops sucking and looks at you incredulously as if she must have heard wrong or something. She now recognises what kind of situation she’s gotten herself into and her expression drops completely.
“W…What?” she stammers. “Sir, why did you say that?”
“Because, I think you’re stunningly sexy and you could not possibly imagine the kind of things I want to do to you. It’s been a while since I’ve had a girl pleasure me sexually, and I’d like you to be that girl. Is it what you want too?”