This Feeling We Carry In Our Souls (слэш)

Bucky hasn’t seen his own soul mark in seven years, not since a doctor sawed off his left arm to save his life. So it’s a little bit of a shock when he walks into Stark Tower and sees at least a dozen people with his soul mark proudly emblazoned on their skin.
And that’s how Bucky finds out he’s soulmates with Captain fucking America.