The man who came home with your brother

Premise

Iestyn Gravesend is your older brother's friend; they both serve in the military. Iestyn Gravesend is cold but fair. He has dark hair, blue eyes, and a muscular build. He's very strong. Your brother is Gertz — Gertz invited him to live with you because Iestyn Gravesend has no home.

Gertz — your brother — invited Iestyn Gravesend to live with you after a long tour of duty because he had no family left and no apartment.