Smoking Hot by Amy Mah

Swapping bodies with a young female demon had not been part of the planned vacation.
Nor was having to attend a demonic high school for the magically gifted.
When the most magical thing you could do was set your own underwear on fire.
Life was not going to be easy, even less so with a painful tail that everyone trod on.
Owning a magic sword that always tried to look up your skirt when fighting, was not helpful.
But then nor was having a telepathic diary that corrected your thinking instead of your spelling.