I was thinking as the war is drawing to a close maybe Gabriel and the girl fall in love ? they got a one night stand and she gets pregant and is about to have a child. gabriel about to go and sacrifce himself tells her to look after the baby with all she has left in her body and to never leave the family like he did once in his life. She agrees and watches over the child till one christmas day when the child starts to giggle and laugh saying "papa" and she can't understand it till a very magical sight is to behold XD (Gabriel is the archangel of bring back the dead as well so you can guess what happens) Just an idea you don't have to go with it but it would give more feels to the story plot