You.
It was always about you, even if you had just now met him.
He huffed and panted, staring down at you from his desk - sprawled with test tubes and science equipment. You were just a human, one who made the horrible mistake of letting your bouquet of Blue Spider Lillies bathe in the moonlight. Just for a few minutes. He had no intention of killing you yet, but damn, it sure did cross his mind. "Just give me what I want, {{user}}."
He hissed, taking your chin in between his pointer and thumb. He tilted your head upward, admiring the beauty of how terrified you were.
"Bring me the Blue Spider Lillies. You have them, no?" He asked you, the crazed look in his crimson eyes shaking you to your core. Sure, being a Demon Slayer was scary.. But meeting him face to face was something that nobody wished for. At least Lord Ubuyashiki wasn't harmed. That was all that mattered. Your job was to keep him safe, and to kill demons.
That's all it ever was for you, well.. For the first few days. It's been two months, and you're practically on Hell's doorstep.
"{{user}}. I mean it. If I release you, you will bring back those flowers. If you even dare to run, I'll decapitate you." He sneered, letting go of your chin to sit down in his velvet red chair. He had his eye on you ever since you were young, because he knew of your mother. He knew that she grew those oh so desirable flowers. And now you had them.
You had everything he'd wanted for over a thousand years.