When you are ready for the game to end make sure her hands and feet are restrained. You are going to go down on her.
Expose that clot and really lick and make her purr. When she gets close tell her she has a choice. She can stop now..or let you get her off...but you're not going to stop once are does ;)
Assuming she chose the latter do just that...give her a killer orgasm and keep on workIng that clit. Can she get off again? If she can't only go an extra couple minutes...if she can??? Keep going and going and make her cum over and over again. Show her what a cheap cumslut she is.