Halloween is when a witch's powers are at their greatest.
How shall I enchant your cock?
Perhaps I will steal a year's worth of orgasms from you and give you constant teasing in their place.
Or make it so you can't stop masturbating but can't ever cum.
Of course, I might be persuaded to be somewhat merciful with my spells if you agree to be my sex toy for a year.
I think that's what you want: to serve me, fear me, and need me.