Here is my response for the mutual break-ups challenge on The Dark Lord's Most Faithful forum. My assigned pairing was Justin Finch-Fletchley /Seamus Finnigan.
Mutual break-ups
Prompt: This time, the theme is mutual break-ups! That's right: I want you to write about two characters ending their relationship but remaining friendly afterward.
Here's the catch: you will also be picking a number from 1 to 50. Each number corresponds with a randomly generated crack-pairing (well, they're not all implausible but I have thrown out anything that is canon or commonly shipped).
Word Count: Keep it under 2000. You're super epic if you make it 1337, however.
When I was in my fourth year at Hogwarts I discovered that I was different. I dated Lavender Brown during the Yule Ball but I didn't feel anything for her. She was very pretty, and yet I never had the urge to kiss her. In fact, I don't recall having ever been attracted to a girl! I admit that sometimes I had fantasies involving my best friend, Dean Thomas.
It took me many months to realize that I was in love with Dean. I didn't tell him about my feelings because I was afraid of losing our friendship. When I was in my fifth year at Hogwarts, Dean convinced me to join Dumbledore's Army, a secret organisation initiated by Harry, Hermione and Ron. There I became friend with Justin Finch-Fletchley. We had many things in common and soon we started being more than friends. He was my first boyfriend. We kept our relationship a secret because I didn't want people to know that I was gay. We had been together for several months when we had a major argument. After a week without speaking to one another, Justin arranged a meeting with me. I hoped that he would apologize, but he wanted to see me for another reason.
"Seamus, I think we should break up!" Justin said.
I was speechless! I thought that we could solve our problems, but Justin didn't seem to agree.
"Don't be so surprised! You knew that this was going to happen. We haven't spoken for a week because you were too busy spending time with Dean!" he continued.
"So it's about Dean? He is my best friend, I can't ignore him! You know I love you!" I said sincerely.
"I want to break up with you, but not because of Dean. I'm tired of being your dirty little secret! My family and my friends accept my orientation, but you are too afraid to tell your mother about me. I know you hired that girl to pretend that she is your girlfriend, because you don't want your mother to suspect anything. I think I deserve to be with someone who isn't ashamed of me!" replied Justin.
"I'm not ashamed of you! The truth is that I am afraid to tell people about my sexual orientation! Plus, sneaking around is exciting."
"Well, I'm tired of hiding in dark corridors. You still love Dean, but he will never like you that way. I fought for you hard and for a long time. Now I'm too exhausted to keep on fighting any longer!"
"I understand… I am sorry that we're ending up like this. You are my first boyfriend and I will always care about you! I think it would be better if we remained friends," I said with sadness.
"So no hard feelings?" he asked.
"No harshities, bro," I said.
We knew that we were making the right decision, and I have never regretted that we broke up then.