Draco watched her carefully before he responded, giving her hand a squeeze. "I doubt that, unfortunately. I- I read something when we were initially researching bonds. It said... well, it said the purpose of some bonds, particularly a bond of blood, was to ensure a magical compatibility in every aspect of the pair’s embodiment. The passage further explained that some bonds had to be... completed, without the use of a contraceptive charm or potion. I think the exact phrase was-"