Hermione went upstairs to her dorm and, making sure she was alone, pulled out a box of letters from under her bed.  She found these in a closet at the Potter's home in Godric's Hollow when she went back with Harry after the war.  She didn't know who they were from, but she knew who they were to.  She was re-reading them a few weeks ago when two things caught her eye in one of the letters.  She read that same letter again today:

September 19th, 1997

Dear Lily,

Please come back.  James actually came by my house yesterday, hoping you had come back and maybe stopped here first.  We had a civil conversation - a very awkward one but civil all the same - talking about possible reasons why you left and where you went.  I have a theory, but didn't tell James because he would have freaked out and hunted you down on the spot; you know how he can be.  All brave and chivalrous and yada yada.  Sorry, I'm getting better at not insulting him because I know you care about him.  

Anyway, back to why you left.  I remember that night nine months ago, don't think me daft.  You left exactly one week after that night, and I think I know why.  You're pregnant.  Believe me, I'm not proud in aiding your cheating on James, and I'm particularly not proud of how it turned out.  But you don't have to have this child alone.  It's probably due somewhere around this time, and I've faced my fears about it and am ready to be a father.  You don't even have to tell James that you're the mother, just give it to me and you can say you found the child on the street.

Please come home Lily.  Everyone needs you, James needs you, and... I need you.

Love, 

And that's where the letter ended.  On every other letter, the name being signed had been burned off, too.  But the two things that caught her eye were: one, Hermione had always assumed that the letters were from James Potter to Lily Evans.  But they couldn't have been if it talked about James through someone else's eyes.  So who was it?  The second thing that caught Hermione's eye: the letter talked about how a baby was due around the time the letter was written.  And the letter was dated on Hermione's birthday.