What I can remember:
- It was and Alpha/Beta/Omega universe.
- Bucky was an Alpha and Tony was an Omega.
- The winter soldier is a separate personality to Bucky (I think).
- The winter soldier was impressed with Tony disarming him when they first met/fought in CACW.
Also, if there is another other stories similar or completely different but still is a Tony/Bucky pairing, don't hesitate to share them! I would love to see other stories of the two.