An Angel's Torment — Valerie Twombly

Prequel to Fall Into Darkness:

When an angel falls in love it happens hard and fast.

Archangel Tegan is an elite soldier who has lived centuries bound by duty and honor, so when he is chosen to procreate with a human, he never thinks to question his orders. Once he realizes the depths of his emotions for the fair-haired beauty who carries his child, he attempts to claim Ana as his own. It is only then he discovers just how forbidden a relationship with her really is and the lengths his commanders will go to stop it.