Rogue's Pawn (Covenant of Thorns, 1)

This is no fairy tale… 

Haunted by nightmares of a black dog, sick to death of my mind-numbing career and heart-numbing fiancé, I impulsively walked out of my life—and fell into Faerie. Terrified, fascinated, I discover I possess a power I can't control: my wishes come true. After an all-too-real attack by the animal from my dreams, I wake to find myself the captive of the seductive and ruthless fae lord Rogue. In return for my rescue, he demands an extravagant price—my firstborn child, which he intends to sire himself… 

With no hope of escaping this world, I must learn to harness my magic and build a new life despite the perils—including my own inexplicable and debilitating desire for Rogue. I swear I will never submit to his demands, no matter what erotic torment he subjects me to