Blood by leveragehunters (Monkeygreen)
In a world where magic is as commonplace as electricity, HYDRA worships a god who craves order through death. They used His blood to create fierce Soldiers then enslaved them by chaining their souls.
The man who was James Barnes is the last Soldier, the rest having been put down after succumbing to the call of the Blood. One night, out of control after a mission, the increasingly unstable Soldier runs into Steve Rogers. Instead of being turned into a red smear on the ground, Steve successfully talks him down. HYDRA decides to keep him. The Soldier's the last one they've got; if Steve can keep him calm he's going to do it whether he likes it or not.
Like fractious racehorses have companion goats, they hand Steve off to the Soldier as a kind of pet. But studies have shown pets can ease depression, despair and loneliness, lead to an increased sense of safety and well-being, and provide a source of protection and unconditional love. HYDRA really should have reviewed the literature before they decided to give Steve to the Soldier. Especially since, once Steve Rogers is involved, protectiveness can get slightly out of hand.
