Bucky is married to Y/N, but no one, not even Bucky knows her complete past. Bucky loves Y/N, they are both Avengers and live in the Avengers compound.

Bucky is a super soldier and has a metal arm, due to 70 years at hydra. But Y/N? She's a vampire, that's over 200 years old and even been in a few wars. Y/N is also a black magic witch along with her vampire abilities.

Bucky sees Y/N drinking out of a blood bag while she's in their room, since she thinks he's on a mission.