You see the door open onto a forest scene.
You read the note:
Changed you are from what you were before.
Enjoy your body my new Wereboar!
In the forest of delights
Where Weresows wait on frosty nights.
At the mention of Weresows, your corkscrew cock twitches and a pleasing scent wafts from the opened door.
It looks like twilight through the door and you find yourself drawn to it.
You go through the door...