While jogging Hayden falls into some ruins and finds a magical ring which allows her to swap almost anything she wants. It starts with the boobs she's always wanted and spirals from there. After all, who didn't like a girl with a cock hidden in her thong.
Stiles wants Derek and is willing to use any means necessary to get him, even if it means doing so against his will. But somewhere along the way their relationship changes and Stiles wants Derek for more than a toy. And what about Peter? Where does he fit into Stiles schemes?