Black Magic Sanction - Kim Harrison
"(...)and I frowned when I realized the file it was sitting on was Nick's.
Nick as in my former boyfriend Nick. Ex-rat, ex-boyfriend, ex-alive if I ever got hold of him Nick.
My shoulders tensed and I forced my jaw to not clench. Nick had been a rat when I met him. A real rat, with whiskers and a tail, transformed with witch magic by a peeved vampire
(...)I couldn't say much about that, though, since I'd been a mink at the time, thrown into Cincinnati's illegal rat fights for having been caught trying to pilfer evidence of illegal bio-drug activity from beloved city son Trent Kalamack."