I like the idea of slow change between a strong friendship to love. It's hard for them to realize they don't need much change in their relationship already because they already cared about each other and have fun. The only thing is that they didn't see each other in the light like they do now. When that change happens it feels weird you then and they wanna look like a regular couple but don't realize that they should just do what they usually did. If it was fun for them already, just keep doing it but grow a stronger bond while at it.
Coupledom 101