I Need A New Outfit

When I was a child, my family had one of my mother's friends living with us.  She had a son, five years older than I am.  He became my older brother, even though the two of us are not related in any way.

When I was eight, he ran away to live with his father.  The two of us have seen each other only intermittently since then, but he's still my brother.

Now he's getting married.  The two of us hadn't spoken in quite a long time, although he'd sent me an invitation seperately from my parents (with whom I still live).

Yesterday he called.  He wants me to be his best man.

Of course I said I would.  He's my brother, after all.  There's no way I could refuse.