Anyone you feed from will become a vampire.

If we're able to bring the blood tablets with us – and, perhaps, even if we aren't – I know of someone who might be able to reproduce them. That is, however, far from a certainty. [He moves from the door, drawing near, wrapping his arms around her and holding her close.]

So, if you are a vampire, if you do need to feed and we can't find a substitute... I'd thought it was obvious – you would feed from me. [There was no hesitation, no uncertainty. ]

[He was willing to give up his humanity, to become a vampire so she would have someone to feed from. He understood that it would bind him to her irrevocably. But that was a commitment he was willing to make. That was what he was willing to become, if it meant being with her.]

... But... if that would be too much for you... if that isn't something you're ready for... I meant it when I said I'd go wherever you will. We can still go to your world. [There would be blood tablets. Other vampires to feed from.]

[Being together was more important than where they'd be together.]