Based on the concept of the koorime portrayed in Complicated by lostmagnet partially because I also thought of it while reading said story. I hope you don't mind me borrowing such a useful and original concept. It may be of interest to check out that one for further understanding of what happens.
A tall dark shadow stole into her room of the temple. Master Genkai never noticed, no one would ever know. Had he been a thief he could easily have given Youko a run for his money if not for his power.
Long black hair flowed down to meet the black clothing, obscuring all but two lavender eyes in the darkness of the room. Those eyes captivated her as he stepped slowly closer.
The red head had been a lost endeavor, but when he saw her in the stands…
There had been new purpose for him. He would have her, and in such a way that her fire apparition brother would not be able to do anything about it.
At her bedside he stared into the vibrant red eyes that stared right back. "I like you," he said openly, " and I want to have you."
"Then take me," she challenged, undaunted. "But take me for real, not just my life."
A gleam shone in his eyes as she threw back the thin blanket, the only cover she had on. He'd learned better control, his touch didn't have to kill right away. He could enjoy her if just this once.
His jacket was off before he even got on the bed.
-----------------------------------------------------------"It's too bad you didn't know," the soft voice chuckled in the darkness. Even the moon hid in the clouds as the deed was done. The body disposed of so none would ever know.
"The only lover more dangerous than a kitsune…"
The cloud cover blew past, revealing a full moon that washed the nighttime world in it's stolen light.
"…is a koorime."
Yukina looked to the large block of ice containing her late-night visitor.
"In your desire for my life you neglected to care for your own."
She touched it and the ice shattered to pieces, taking along the bomb-wielder.
"And so left it for me to take."
She swept the pieces of ice, so like shattered glass, onto the former demon's jacket. Folding in the rest of his clothes once it was all off the ground. She had frozen and disposed of him nude.
The folded cloak she then froze too, assuring all pieces were inside it. That she brought to the shrine entrance and pushed down the main staircase into the open forest. Before it had even fully thawed some lesser demon would have found of it and done what they chose. Soon there would be nothing left but the memories, of which tonight no one else would ever know.
Watching the giant ice cube glide along until it was out of sight as the moon again hid behind clouds she smiled a secret smile. One that might even have scared her brother.
"Negligence leads to disrespect."
Kitsune are vampiric lovers but koorime are more like black widow spiders, killing off their mates.
Please don't ask where this came from, I already said I have no clue, and I can't even be sure it makes much sense. It's one of those things that writes itself and all you can do is keep getting it out so you don't go crazy of it. I warned you it was weird.
Please let me know what you think.