So, seperis is running a Dead Letter Challenge, where the idea is to kill off a character and write a letter from them to someone, to the world, whatever. It may be slightly cheating to use a character that might well be coming back someday, but I couldn't resist writing one from Simm!Master to the Doctor.
My Dear Doctor,
I hope this finds you well. I'd hate to think you were doing something tedious like pining, and if I'm going to cause you pain I'd rather be there when I do it. Speaking of which, you should have seen your face. I wish I had a nice hologram of those last few minutes on the Valiant, not that I could watch it at the moment.
Very poetic, by the way, burning my body. It's becoming a bit of a habit with you, isn't it? Burning Gallifrey? It's not even the first time you've watched me burn, but I'll let that pass for now.
Having fun with your little humans? Humans and…whatever Jack is. Tell the freak hello from me, and give the lovely Miss Jones my love while you're at it. How are the TARDIS repairs coming along? I hope Jack didn't do too much damage, as it's a bit difficult to get the parts these days. Still, that's your own fault. Made your bed, lie in it, etc.
I'm rather insulted that you don't seem to be expecting me back. How long have you known me? Did double genocide affect your memory? Really, Doctor. I expected better. Still, it'll make it all that much more entertaining when we meet again, or else I'm giving you false hope, which has its own charms. Either way, I win. I do hope you're keeping score. See you soon.