"Well," Pansy said, taking a gulp of wine, "they added the Unbreakable Vow rule after we left. Or rather, after we were exiled. No need to hide it from you two, we were pretty close with them back in the day. Don’t judge," she added, raising an eyebrow at Hermione who was fixing her with a murderous glare, "we did what we had to in order to hang on to a bit of power. Our families were disgraced after the fall of the Dark Lord."