Searching For A Story,,Please Help

I'm hoping more then anything someone on this wonderful site can help me.I was on last night and doing a marathon reading session when one story really hit me.I didnt have a chance to save it and i cant recall the title.Please someone come to my rescue.
The facts i recall are the fact it dealt with two male friends in high school and one character was Don/Dawn who ends up becoming a secret admirer and going to great lengths to boost the friends moral after being dumped and ruined by a girl. Dawn comes to terms with the fact she was meant to be a girl and she has infact fallen in love with her best friend. It might have been a retro classic but dont hold me to that