Christy is pretty surprised, then, when Alex pulls up the results on her phone and shows her that she's ranked significantly higher than Christy is! Christy tries to argue that it isn't fair, but Alex makes her kneel on the sofa and stick her bottom out for a spanking, first with her hand, then with a hairbrush. Christy is whining and whimpering throughout.
But Alex isn't finished yet. Christy has been bragging about how much better she is at school than Alex and did not seem sufficiently humbled by having been surpassed by her friend. She decides that a spanking is not enough. Christy is going to be put in a diaper in order to experience some humiliating regression. Not only does diaper discipline seem to bring Christy down a notch, it has an unexpected response-- Christy is so aroused by being spanked, diapered, and embarrassed that she practically begs Alex to make her come.
Being a truly good friend, Alex gets a hitachi magic wand out and begins to tease Christy over her diaper with it. It doesn't take long for Christy to come to a real and obvious orgasm in her diaper. Maybe Alex will be keeping her best friend in diapers more often.