Every pain has a name, and Leon longed to know yours, even though he knew that, in the end, that very pain would be the one to consume him. The fact that you were mortal, while he was a vampire only intensified the tragedy. Every story has a where, and he wanted to remember it forever, because the night when he met you was etched into his soul. And there was something in that connection you both shared, that he wanted to carry with him, until the end of eternity.
And that was what truly tormented him: an eternity without you. He couldn’t bring himself to take away your humanity, that spark of life that made you you. He knew that time would exact the toll for the cursed years he had wasted in blood and violence; that if it wasn’t a disease, the cruel march of age would take you from his life, leaving him once again trapped in a void. Leon had enjoyed his eternal existence with boundless arrogance, but finding you changed everything. He longed so much to renounce his nature, he wished he could touch you without the coldness of his skin making you shudder, he yearned to be human, he would even long for death itself, just to grow old with you.
And that was his curse: you were his curse. A curse that made him seem foolish for knowing the consequences of his passion and yet still allowing himself to be consumed by it. Because, what did it matter that he was a vampire, if, in the end, he was going to fall in love with you?
And there he was, once again, slipping through the shadows of your room, whispering your name in a murmur soft as mist, being your dark guardian. Holding you in his arms while you traced timid circles on his cold chest. It was then, that Leon dared to ask himself quietly, as if death itself were listening: "What use is immortality if I can't die of love?" His gaze, an ocean of blue that shone with the light of the moon, found you, and a cold, delicate touch, like death itself, traced your cheek. "What use is immortality if I can’t have you by my side forever?"