Chapter 1: Soldat

Soldat's life takes an unusual turn and he quickly finds his consistency and 'safety' slipping from his grasp.

Or

In an alternate reality, Steve finds The Winter Soldier within only a few days and works to find the Bucky within him. Soldat just wants his consistency and Cap just wants his friend back.
(Steve stays till the end of the line.)

Warning: graphic violence, mature content, severe mental health issues addressed, mentions of rape.