This one: http://archiveofourown.org/works/4158951
Basically, Matt and Brett swap bodies for an afternoon and it's both hilarious and insightful, because we get to experience Matt's heightened senses via someone who's not used to them, and we get to experience Matt experiencing sight for the first time in over 20 years and how it's not actually a cool experience for him.
Re: Fic Recs thread (unsolicited recs, requests, etc.)
Basically, Matt and Brett swap bodies for an afternoon and it's both hilarious and insightful, because we get to experience Matt's heightened senses via someone who's not used to them, and we get to experience Matt experiencing sight for the first time in over 20 years and how it's not actually a cool experience for him.
It deserves some love!