You meet your girlfriend's cute sister who seems to be somewhat bummed over the fact that her little sister managed to catch herself a handsome guy like you. It seems that there is an ongoing rivalry between them and she is on the losing end. You offer your service to help her catch up and though first she refuses, after hearing that her sister again went ahead and had some fun without her, she decides it is time for revenge… and a big one at that.
Mixing into the catty argument of your two step-sisters would be a bad idea, but throughout the years you became the master of how to turn them against each other to profit from their petty fights. Like now, when you convince your gorgeous step-sis Kara that you support her. This way you can take a closer look of her french pedicure while her feet is around your cock.
S