Nikolaj aka 'Nick' & Simone aka Zaychik moy (i.e. little bunny) 
 What a beautiful mess I'm in! 
 After so many books FINALLY Simone and Nikolaj... 
 We got the first glimpse of their story at book Hunted (Dark Protectors, 3) -if I remember correctly. 
 Nick, as a man of honor, sacrificed his love for Simone more than a century ago. He had prepared everything. The house, the ring, the words. And suddenly fate and destiny happened and Nick broke SimoneaEUR(tm)s heart. The demon nation needed him. 
 Nick never stopped loving Simone. Nowadays, the war is over. NickaEUR(tm)s role in it has been concluded and Nick wants his intended mate back. 
 Unfortunately Simone does not trust him anymore. Not that she trusts any man anymore. 
 Her heart had been broken again about a decade ago by another witch. Moreover, she has become very powerful and very important as a member of Coven Nine where only dominant witches are members. There is no room for games. She likes to be bitch and there is no way that she will show vulnerability for Nick again. 
 But fate happens again. Being accused for something she has not done, Nick will resume the role of her protector. No matter if Simone likes it or not.