Sherlock Holmes / Iron Man Crossover ?

[wlk68.livejournal.com]

I'm looking to find a specific ficlet I read awhile back. In it, Sherlock Holmes and Tony Stark are the same person and he is somehow immortal but Watson is not. Stark/Holmes is missing his dead lover/friend and tries to make the computer generated voice of Jarvis sound as much like Watson as possible.   

IIRC, the story itself is fairly short but very impactful.

MODs: I looked for death or immortality tags but didn't see any. Hopefully the ones I chose will be sufficient.

Thanks.