Sydney eventually recovers herself. Getting on her knees, she presents her ass to your view. She says:
"But I know your wife can be cruel sometimes, and gets excited by denying your orgasms. I promise you I'm not like that. I'll make you blow your load so hard you'll remember it a very long time!"
It looks and sounds extremely tempting. And you dread the prospect of another ruined orgasm more than you can say. But you know that it's going to be important to show Sydney all the loyalty you can before Faye arrives...
So you very reluctantly say no, that you really do need to get back to your wife.