Eric (Discworld, #9; Rincewind, #4)

by Terry Pratchett

while they are of course irredeemably evil, they are not always bad.

*Just erotic. Nothing kinky. It’s the difference between using a feather and using a chicken.

The whole affair was very embarrassing to wizards, as it always is to people who find out afterward that they were on the wrong side all along,**