I'm trying to remember this fiction for a week and it's driving me crazy.
All I remember is that Justin has many unfinished drawings - for some reason he was able to draw only Brian's upper body.
I know it's not much, but maybe somebody will remember it.
Thanks,
Nadya
Edit: Not found I found it myself, thanks to wouldbedorothy's hint - It's "Turning Points" by Britin.
https://www.midnightwhispers.net/viewstory.php?sid=846&textsize=5&chapter=8