Who Prays for The Devil? (слэш)

When Steve Rogers does something nice for the wife of one of the largest Russian mafia families, Winifred sends her son, James Buchanan Barnes, to offer him a 'favor' in return. But Steve, who is incapable of seeing the bad in anyone, ends up missing the fact that Bucky's in the mafia entirely and thinks that this brick house of a man wants to go on a date. Bucky, finding this clueless yet confident coffee shop owner refreshing and adorable, decides to give it a shot.
What blooms is a lovely romance between the two, where Steve is constantly surprised that they always have the best seats at restaurants, that Bucky seems to know everyone in Little Odessa, and that Bucky has a crap ton of guns in his apartment. But why do all of Steve's friends go pale when Bucky comes around? How does Natasha know Bucky? And when Steve's health starts to get in the way, how far will Bucky go to make things right?
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A mafia AU slams into a coffee shop AU, and out pops a cracky, fluffy, smutty, and angsty identity porn fic between son-of-a-mafia boss Bucky Barnes and clueless coffee shop owner Steve Rogers that takes a brief look into the bowels of the American healthcare system.