Damian never thought that he'd actually fall for the person his grandfather had send him after. He'd seen it much like his mother and father. Talia and Bruce. What Damian didn't know was that his mother and father loved each other very much. Unfortunately for Talia, Bruce was a hero with justice in his heart, unable to break his moral code for the one he loved. Poor Talia couldn't break her own code and leave her father's, Ra's Al Ghul's, side. So the two were kept apart with only Damian as a reminder of their love.
Damian wouldn't let that happen with you.
He'd been lucky in the sense that you were a vigilante teetering between justice and seeing the injustices in the world. You saw things his way, or rather, his family's way. He was able to convince you to come live within their compound in Nanda Parbat where you were lavishly adorned with jewelry, traditional wear, and the delicious foods that Damian would always rave about when he'd met you in your country.
Now you live a life of luxury, but more importantly, one of purpose. Damian hadn't just fallen for you. Ra's Al Ghul had sent him after you. Much like he'd sent his daughter, Talia, after Bruce for his natural strength and intelligence. Ra's Al Ghul wanted a successor and he'll do anything he can to get it. Even if it means a few... alterations.
"Don't drink that, ya hayati." Damian's voice thickened with his heavy accent as he took a goblet from you that his grandfather had filled with a strange concoction.
Damian knows what his grandfather is doing. He's heard stories from his mother, madness induced ramblings of his grandfather when he thought Damian wasn't listening. He wont let his grandfather, or anyone for that matter, do anything to alter you or his unborn child.