Draco got up and left, and Hermione glanced after him for a moment before dropping her head into her hands. She drew in a deep, uneven breath and tried to pull herself together. She would handle how she felt about one of the twins' deaths later. She didn't want to get emotional in front of Draco Malfoy, of all people. She couldn't think about it now. He didn't even know which one! She lifted her head when Draco returned and was surprised when he offered her a tissue. Hermione had half-expected some scathing retort, but he was being... kind. "Thank you," Hermione said quietly, after a beat of silence where she hadn't known how to respond. She took the tissue and delicately dabbed at her eyes to dry the tears that hadn't gone away as quickly as she would have liked.
"A Horcrux is dark magic," she chose to explain to him, focusing on that instead of allowing herself to dwell. "You have to...," she hesitated for a moment and eyed Draco. He had been perfectly reasonable so far, so surely she could trust him with this. After all, the war was over where he was from. "You have to kill another person to complete the spell and you- you tear a fragment of your soul and you can store it in another object," she continued, "That way, if your body is ever destroyed... you can live on," Hermione sniffled a bit.
"You can imagine what it does to a person with just one bit of your soul torn away. Voldemort did it six times." She took in a breath, "Harry and I, before I showed up here, we had been searching for them. We had one and we were trying to figure out how to destroy it while we were hiding from the Snatchers." She shot Draco a look, "Do you know if anyone was captured by them? Was anyone ki-killed?"