Can someone recall this Hallowe'en fic please?

[catrinamarlow.livejournal.com]

 

It was House/Wilson in Hallowe'en costumes as Holmes and Watson and House had taken something and only later does Wilson discover (I think) it was morphine and House is stoned. That's all I remember, but I do think it was a short length.

I found a lovely fanart pic I want to share with the author of the piece, as it fits perfectly with the fic. 

Someone here knows the fic I mean, I'm sure.

Thanks in advance for the flood of replies I'll get.

(no subject)

[lostwiginity.livejournal.com]

Are there actually stories where it turns out House is Chase's dad?