Insatiable — Elle Thorne

Alexa's the alpha sister of Lézare. She's got to worry about the Arceneaux Masquerade Ball because her brother's gone gallivanting to Austin.
Except this once, she'd like to concentrate on her own pursuits.
Namely one.
Reese.
Reese Nielsen is an alpha wolf with a territory of his own to worry about. And that whole damned underground fighting ring. He's got information on it, but with Lézare MIA, Rory waits until the time is right.
Except his heart and his tiger have an agenda of their own: the curvy and hot sister of Lézare, a white tigress with a mind of her own, and a temper to boot.
Things heat up in the midst of a Masquerade Ball.

BBW Paranormal Shape Shifter Romance
If hot sex skeeves you out, you may want to pass on this book.
If freaky, downright dirty sexy talk bothers you, yeah, for sure you gotta pass on this one.
We believe in sex--hot, dirty, delicious sex.
Yup, make it sweaty, too. It's not just sex, it's about the romance.
But good romance has sex, and we keep the doors open! Oh, and the lights on! ;)