Kaori
They waited for hours, even after Ash turned to Kaori and got to work on her, but her form never faded. Currently, Ash was on her knees while Kaori sat on the bed, her strange tongue sliding between Kaori's lower lips.
"Oh, gosh, sh- agh," Kaori moaned as Ash grinned and continued.
This went on for so long, Kaori pretty much passed out by the time she came. Ash didn't do the same thing to her that she'd done to Keiko though, instead, Ash simply stood by after Kaori orgasmed.
The black wings, the violet skin, the enlarged horns, and that wide grin on her face all remained throughout that time. Eventually, Kaori felt tired enough to sleep and the group decided that maybe it would fade with some more time, so, Kaori and Keiko went to sleep while Ash waited for her form to go away.