Ruthless Demon by Callie Rose

I fell in love with the devil. Now I’m a prisoner of Hell.
“Fragile things can be broken.” That’s what Cephalus told me after I woke up in a cell in the underworld. His captive. His bargaining chip.
He plans to use me to force Lucifer back into service in the endless war with Heaven, blackmailing him into returning to Hell. And the worst part is, his plan might work.
Because if there’s one thing I know about Lucas Hale—aka Lucifer himself—it’s that there’s nothing he wouldn’t do to protect me.
But as dangers mount on all sides and a new enemy lurks in the shadows… can I protect him?