Alpha Xander: His Contracted Luna

"You killed my mate. Now you have to take her place," Xander announced to the bewildered Catherine, who had no idea what was happening to her.
"What do you mean by I have to take your mate's place?" she asked, shocked.
"Be my contracted Luna," Xander said dismissively, giving Catherine the next round of shock.
Catherine was sad and got drunk after being dumped by her long-time boyfriend. Drunkenly, she knocks down two wolves, and she discovers herself in Xander's bed the next second.
Will she accept his proposal of being a contract Luna, or will she escape from there? Will they fall in love at the end?