"Youko Moon [Yu Yu Hakusho]" by A. Palmer

'Kurama had secured the window seat as his own, and now sat there with silver moon- and starlight highlighting his hair, making him resemble nothing so much as his youko self. One hand was cupped slightly before him, small tendrils of green-white twining around his fingers as a slender stalk, topped with a blossom bearing petals of sapphire-blue and garnet-red --which glittered from trace amounts of his youki--, swayed gently in the air above his palm.

Yuusuke sighed, sounding extremely bored. 'Kurama, what kinda' plant is that, anyway?'

A small smile flitted across the redhead's face. 'Just an average Makai wildflower. It's called Mi'snarii. 'Changing Ways.' '

[......]

'Hey, Kurama, you feeling all right?'

The kitsune chuckled, shifting to face Yuusuke fully, giving the Toushin an unrestricted view of glittering, golden eyes and a red mane streaked liberally with silver and gray. Where his ears usually grew, there now were two, malformed triangles of gray fur.'

-- from the story Mission X, by Kurome Shiretsu; chapter eleven: Youko Moon.