From what I remember, Dean Winchester was running some type of diner or pit stop in the middle of nowhere. I believe it was in a desert, possibly along a long highway as it was a long way between stops. Dean made pie for the customers and either had to have the fruit shipped in or trade for it. One of the Avengers-I believe it was Captain America on a motorcycle after the events of Avengers-stumbled in. Eventually all the other Avengers stop in as well to see why Captain America continued to come to the diner/check Dean out. It is possible that every chapter was titled the name of a different character.
Dean was in hiding from Castiel and the diner/pit stop was warded against demons and angels. I think there was a showdown and I remember Thor recognizing that Castiel was an angel/different. I think it occurred when Castiel was still under the influence of the Leviathons. I think Castiel also attempted to get to Dean through dreams or suggestions to get him to leave the warded area.
I remember that there was a discussion around tattoos and I think Dean talked Captain America into doing some type of henna or sharpie tattoo seeing as it was hard for the ink to work with Captain Americas enhancements and healing factor. Dean had tattoos/wards on his body/arm.
And with all those details, I still got nothing...so, help me Obi Wan Kenobi? You're my only hope.