The Fifth Sorceress, by Robert Newcomb

This started off as an ideal Yuna book. It was funny, had drama.

Then a friend let me know that there was definitely un-Y rated material later on. So this book has gone on the return pile.

I give it 4 star rating because the main protag isn't female (yes, today I'm being fussy), although he is entertaining. I loved the horse sidekick who had attitude!