Spke growls deeply at the words, and the demon doesn't hesitate.  Given permission, he takes his fangs and scrapes them across her neck to open a jagged s, car.  His fangs pump his essence into the open skin, permeating it, making it bond with her skin on a molecular level.  He licks lightly over the scars, enough to stop the bleeding, but not enough to close them completely.  The small scars and the scent will mark her as his to anyone with more than human senses, now and forever.  She is his Claimed.