A\N Éponine doesn't really have a pairing so I just did Marius. This takes place after "One Day More" in the Broadway version.
Go to doctorandriver to look at the challenge.

       I walked through the streets. I heard a shout behind me.

"Hey Éponine!"

I turned around, it was Marius.

" 'Ponine! I have something. "He said as he pulled a letter from his pocket and gave it to me.

     I read though it.
It said:

Ever since I meet you your love has been like oxygen,
I can't live without it.
When I'm with you I feel a happiness I only feel with you.
I love you.
I love you so,

Marius.

Was this for me? No, he loves Cosette...but mabie...
    
     Suddenly I had a small bit of hope until,

"Will you take that letter to Cosette?" Asked Marius.

Boom. Hope gone.

"Yes"

    I had to do this, for Marius. He may not love me, but I love him so I'll do it. For Marius.