Stranger fuck with my best girlfriend's boyfriend & SHE CALLS A

His girlfriend isn't here yet, but I've been keen on her new boyfriend for a long time. I immediately went on the offensive and showed him what I have to offer, he couldn't say no. I suck his cock hard and then SHOCK!!! HIS GIRLFRIEND CALLS ME! what should I do now? Interrupt the fuck? Never, it was just too hot! I was on the phone with her while we were fucking strangers and she just didn't notice! Or did she catch us after all???