AU:
Rose was killed in a battle. The Doctor is looking for a way to save her, but for two human years still found nothing. Rory wrote a letter to Rose every day, that she can read as he lived without her. He waits and hopes.
Day 731.
My dear Rose, i miss you. Every minute of day i think about you.
I became a priest. Maybe I'll be closer to heaven, to you. Ask why to heaven? Because you're an angel, which I couldn't save.
Now the Doctor is looking for a way to save you, but it lasts for more than two years.
I so want to believe that he can do it. I love you so much.
Wait for me, Rose. You always know that I'm coming for you. I'll never gonna leave you. Never, my Fortuna.
Yours ever, Last Centurion Rory.