I just want to tell you that reading this story really ripped up my heart. When you wrote about how Oikawa said he was terrified about the reason as to why the oc was ignoring him, I held such hope in my heart that what she saw was a mistake, but alas that was false. I'm a sucker for angst, but also for happy endings, but when this ended, it honestly tore my apart (although I would not have it written any other way).
Just wow, my breath is taken away at how you executed this story. You made it so believable for me to hope that maybe it was just a mistake, but when you compared the oc's, which was similar to mine, to the naivety of her 10 year-old-self and that really hit me hard.
Also, props to you for making me sympathize even a little bit with Oikawa, the perpetrator and cheater of this story. Usually in stories where the character is a cheater, I have zero sympathy for them. But just the way you wrote it...wow it really made me feel for him. When you wrote about their past and described their friendship, it was so sad to see that Oikawa disregarded that and decided to throw it all just to cheat. That really got me so angry, but then you brought in both of their pain when they had to confront each other and at that moment, I could feel nothing but compassion and heartpain for both of them.
I just really don't know how to describe my feelings in words right now. This is one of the best one-shots I've ever read, and I can't explain nor could I put into words how I'm feeling, but I just hope you know that you really have a gift for writing.