You picked up the small box on the doorstep. Taking it inside and putting the big box in your room you started to read a label glued to the box. "Transformation items" that was what it said.
Your curiosity couldn't hold it anymore and decided to open it, inside you found many types of strange items, from wooden totems with animal forms to strangely shaped sex toys. It said to transform you after using them.
You took all the items and put them on your bed, where you could see the complete variety of the things you could use. At the end it came with a small paper of instructions, just saying things like you could reverse your transformations or even combine the transformations of two or more items. you knew what to do next.