" The rules are this—you do not hurt them. Rough sex is okay if it’s consensual, but no permanent scars or marks. And you may not eat them. Those are my only two constraints, and they are not negotiable.” With Shadows, you always had to set limits. Especially a Shadow like this one. “Wait, are they yours?” the male asked. “Yeah.” “Oh, shit, why didn’t you just say?” s’Ex put out his palm. “My vow. Nothing permanent and no lunch. "
― J.R. Ward , The King (Black Dagger Brotherhood, #12)