"It was a promise we made when we discovered we couldn't remove the collars," Cain explained, rubbing his throat as if trying to get use to the feel of flesh instead of leather. "We are in your debt for our freedom. Ask what you wish of us, and if it is within our power, we will grant it."
Abel rose to his feet, staring at the child with wide eyes. He didn't fully understand the words, but he knew he'd done something wrong. Was it how he worded the promise?