I don't think it's a very popular genre anymore, I've not seen any for a while. Here's hoping I'm wrong!
Basically just any fics where Dean gains the ability to see Cas' true form (later seasons? Say S7+? Ealier ones are fine too, but chances are I've read those)

Bonus points if Dean can see real!Cas for sugary sweet reasons like true love's first kiss etc. It can happen in Heaven, on Earth, in a dream, for a day, forever.... anything. Dean's reaction can be good/bad, angsty, love at first sight... I prefer happy endings though.
One stipulation: absolutely no fics where Dean goes blind as a result. No permanent injuries of any kind.

Gen, destiel or pre-destiel. Please no het.
Top Dean Only if there's sex.