I think this song is being sung by someone back home whose love is at war. She's saying their being warmed by the same sun, but their both fragile, she because she misses him, he because he's at war.
I think this song is being sung by someone back home whose love is at war. She's saying their being warmed by the same sun, but their both fragile, she because she misses him, he because he's at war.