Imagine Dean and Sam getting transported to the French Mistake universe. Only for Dean to realize he is married to you, his best friend, love of his life and... Sam's girlfriend.
You run into a hunter you had been best friends with and immediately its like no time has passed, as you two catch up Dean becomes jealous of how close you are.
Warning of smut content
Note: I do not own any characters or prompts that the Supernatural writers created, only thing I claim is my interpretation of the plot :)