Demon Seed

Chrissy is in love with Josh and will do whatever he wants. But when he dumps her after a threesome with an old flame of his... with no warning and no explanation after a threesome, she wants revenge.
Studying magic from Brian she inadvertently manages to summon a demon named Hector. Hector is a very sexy, virile demon with a nearly constantly rampant appendage. He isn't' pretty to look at above the waist, but he's a great lover and has come to help her on many levels..

And since the horny demon is here...