You walk in and over hear your girlfriend talking to someone on the phone about fucking another man. She is laughing about how small you are too and mentions how much better the sex felt with someone larger. She jumps up startled when noticing you are right there listening. It doesn't take long for the truth to come out. Shes not really sorry either, in fact she begins to humiliate you and tell you that you're never going to fuck her again. Now that she has had bigger and better. She has you remove your pants and take out that little dick of yours to laugh at and compare to her new alphas size. Your future from now on is to serve her as a cuck. She goes into detail about what that will look like and gets turned on just talking about it so she pets her pussy over the panties while you stroke and listen.