Penny stayed in Damien's arms as long as he needed to know that she was still alive and breathing. They had never gone through something like this before. To have her almost die and to come back again to life. It made her wonder if she did die when Damien had sucked the blood out of her body. With the force he had been drawing the blood out, she knew it was bound to happen but that was also the initial idea which was why she hadn't stopped him.
To see him in pain, it had squeezed her heart. Killing the rabbits for him to drink blood from felt like it was nothing. If his corruption would have increased, there was no telling how many more bodies he would be killing and where they would have to bury it. She was glad that in the end, they were both fine.
But Damien was still trying to reel in the truth that Penny had died to only come back alive.