His Dark Jealousy (The Twelve Nights of Christmas, #6)

Jealousy can make a vampire do terrible things.

Kathryn is expecting a visitor—an old friend of Sebastian’s. And now, her friend too.
She’s eager to see him again.

Sebastian would almost rather he’d never introduced them.
Because jealousy has always been his darkest weakness.
And this time, in a moment of possessive fury, he has done something he cannot take back.

Now he must face the one thing that truly terrifies him:
that even Kathryn may not be able to forgive him.