Living ghost

This is from the NaNoWriMo Adopt-a-plot folder where writers post extra plots they won't be using.

#34: "There's this girl who's been able to see ghosts since childhood. Years later, her best friend gets himself over his head experimenting with magick and manages to lose his body temporarily. Antics ensue when he a) tries to convince her that it's really him and b) when they go to attempt to get his body back." -- Lunae

Use it as a 10-15 minute writing prompt or go for a longer piece.