If I Were Wind by Barbara Russell

England 1939
Kristin
Since I discovered that I’m a da Vinci’s Beast—a shifter with the ability to turn into a strong, toothy creature—my life has never been the same. Or rather, since I met Mr Roy Turner, my mentor and unbearably brooding almost-lover.
The attraction between us is growing stronger. Uncontrollable even, and if there’s something that Roy hates is losing control. We can barely talk to each other without feeling the urge to kiss.
That’s why he doesn’t want to work with me. So I have a new partner, someone I’m supposed to work intimately close with. Maybe I should move on and forget about Roy. Not easy since he’s jealous and possessive of me.
But when someone breaks into his room to steal a few documents on the Nazis, and rummages through my things, we need to work together again. Whether he likes it or not.