Something simple. I was thinking of using it in a fic, but the fic idea has changed and I don't think I'll be using it anymore, so I'm posting it as its own one-shot.
Alton's potential letter to Karigan after HKT
Dear Karigan,
I seek your forgiveness. I have been a sorry excuse for a friend. You did nothing wrong, but I have been unable to face you.
When I was lost in Blackveil my mind was not my own. The images I was shown still haunt me. It is the worst at night. You've had enough nightmares; I think you can understand that peculiar type of torture. Although I know that the images were never real, I am ashamed to say that when I would wake in the morning, when I would think of you, I would doubt you. I would remember an image of you singing me a song, a song I used to weaken the Wall, and hate would creep in.
I argued with myself for so long, but after reading your letter I realized how fruitless, how ridiculous, how hurtful my behavior has been. You could never be a traitor. You would never betray king and country. You would never betray me.
I am sorry. If you can't forgive me, I will understand. My behavior has been horrible. But if you can forgive me, I would like to begin our friendship again. It means everything to me.
Forever in trust,
Alton D'Yer, by my own hand