Witch Madison wants you to obey her and if you disobey her she will put a curse on you that will last a whole year. It's in your best interest that you do exactly as she says.
Now, she is in need of cum, lots and lots of cum for her concoction. You will cum for her, she will extract the cum out of you by whatever means necessary. Be a good boy for her and maybe she won't curse you.
Unbeknownst to you once you give her your cum she will own a bit of your soul and you will be her submissive forever.