" She pressed the blade’s tip into her palm and cut. Not as deeply as he had, but enough to ensure a successful exchange. Her blood welled, mingling with the droplets he’d left behind. He liked that, liked knowing some part of him was now inside her.

He reached out, clasped her hand against his, her wound against his. At the moment of contact, he felt a pop inside him, a tear on his soul, and though he’d never done anything like this before, he knew the vow had just made a place for itself inside him. "

― Gena Showalter , The Darkest Seduction (Lords of the Underworld, #9)