@pixel Spent a good chunk of my evening trawling the internet and my own records, but I'm afraid I couldn't find the comic you're after. Only other thought I have is to check Arania's gallery ( arania.kamiki.net ), since lineart with colored emphasis is something she sometimes does, but it's midnight and I am exhausted. I'm really sorry.
I'll take a stab at locating the story on another evening.