The Care and Feeding of Sex Demons — Angela Fiddler

Keeping a sex demon happy and sated is always the safest option, even if you have your own relationship issues. When saving the world on a regular basis, a happy home is very important.

Cy's job as an apocalypse stopper isn't an easy one at the best of times, but with the help of his weird family, he survives. Sure, he sneaks out every once in awhile to watch August, his sex demon, feed, but he loves and is committed to Patrick, his fae prince lover--even if it means foregoing certain pleasures that Patrick doesn't enjoy.
All adult relationships are based on compromise. It's just that most don't require sating a sex demon to keep him alive and non-murder-y, at the same time you're trying to quit your job to save the world on your own time.