  "Magic," Ron informed them and they both gave him a weird look, "Magic is, for lack of better words, recyclable. The magic inside of us is the same magic that was used in the time before even Merlin himself. The magic is reused and placed inside magic users, Muggleborns and Purebloods alike. Now because the magic inside you is so ancient it allows you to be aroused and, more or less, boasts your emotions."