"Of course, dear!" she says, getting into a doggy-style position. "Come on, I'm sure it won't take long to trigger your orgasm, and besides, I want to make sure you aren't too excited when you meet Erica."
You are very tempted, as you are desperate in the extreme... But then you think about all the times you have been tricked, just like this! You get up and say that you have had it with her damn experiment! You aren't going to be tricked again!