They would live at Grimmauld Place until the war was over. Knowing that a little piece of him and Luna was growing inside of her gave him a newfound courage that he never thought he had. He would defeat Voldemort for all of wizardkind, yes, but also so his child could live and flourish.
They would be a family. And their son or daughter would grow up with Ron and Blaise's children. And they would be happy.
Harry was caught in his reverie when he felt two familiar hands come around his chest.
"Mmm..hello, love. I hope I didn't disturb you."