Somebody that I used to know (слэш)

Bucky Barnes, if asked, would say he led an ordinary life. He owned a successful business, worked long hours, had a pain in the butt best friend and dated good looking men on the odd occasion - though if pressed, he might admit he was craving a bit more in the romance department.
But then he literally barrels into a stranger's life, a stranger that might not be so strange after all, a stranger who actually seems to know him very well - but for the life of him, Bucky can't remember ever being friends with such a gorgeous beefcake, who is funny, nice and genuinely seems to like Bucky for who he is.
Suddenly a ridiculous wager is cast, and Bucky finds himself with five guesses to remember how he knows this mystery man.
With nothing to lose, Bucky embarks on an odd but exhilarating adventure, and soon realises that maybe, just maybe, life doesn't have to be so ordinary after all.