Stop for a little bit. Lull her into a false sense of security. Start getting kinky. Eventually get her comfortable enough to let you tie her up or handcuff her.

Leave the room, come back dressed as The Donald and start doing a terrible impression. Ignore her pleas for you to stop. Then after she is reduced to tears/clams up in rage stop and go "Oh, you're right. This guy is terrible. How silly of me."

Leave. Come back dressed as Hitler.