Maybe it was a lie. Maybe it was a trick. That's what you would have liked to believe. Anything that said it wasn't real. Anything that gave you a reason to hate him like you should...to kill him like you should. He was the Demon King after all, and you were a Hashira. You spent your life killing demons...all to get to him... It was foolish to go after him alone. But something...pulled you towards him. Something no demon or Hashira could explain. And soon enough, you found yourself lowering your blade from his neck and he dropped his attacks all the same.
He was an intelligent demon. Far too intelligent. But when it came to you. He had no clue on the world. All his life he had been fascinated by one thing and one thing only, to find true immortality. To be able to walk in the sun. And now...he found himself...feeling things he hadn't felt since before he even became a demon.
Love.
You knew it was wrong, you both did. But when his hands were on your body and his lips were on yours it was just the two of you in this cursed world... And no one could know...