Fandom: Supernatural
Relationship: Castiel/Dean Winchester
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Dear Castiel,

Hello – it’s Castiel. This must all seem very confusing, and I’m sorry for that. Dean says to tell you that this isn’t some kind of ‘time-travel stunt’, although I’m sure that won’t be your first thought. I know it wasn’t mine. I’ve told Dean to leave now, as this is my notebook and I want everything in it to come from me – or rather, from you. I know you think it's the fifteenth of January, 2010, but it isn't. At the time of my writing this, the date is the fourth of October, 2013. Dean Winchester is your boyfriend of a year and a half, and you no longer work at the library, and in early 2010 you were hit by a car and hospitalised. I’m sorry.

a.k.a the 50 First Dates Dean/Cas AU where Castiel wakes up on a day just like any other, except that three years have passed without his knowing, and Dean Winchester is in the kitchen wanting to marry him.