Demon Mate by Sheri Lyn

Brogan Taggert, a wolf shifter and town playboy’s entire world is upended. Not only is he a man, but he’s also in Hell… Literally.
Jericho, a six hundred year old demon was dragged to Hell after helping the town of Blue Creek banish a necromancer. Each day he’s tortured and all he can do is call out to his mate and say I’m sorry.

They say the road to Hell is laid with good intentions. It’s time for Brogan to find out if the old adage is true. Can they rescue Jericho and have their happily ever after?