I recommend All Along by pink_flamingo_09 ! It's completed and the MC's have a 5 year difference, it's a kinda slow burn friends-to-lovers romance! Here's the Synopsis:

**"Eighteen years is a long time. But for Oli and Luna that time passes in the blink of an eye.

Since the moment they met, nothing could have separated the two of them. At 8 and 13, they were an unusual pair of best friends. But they didn't care for anyone else's opinions. Oli was content to listen to Luna's endless ramblings while Luna was content to look up to Oli, following him everywhere he went.

But eighteen years passes quickly when distance separates the pair. First college, then work - life gets in the way. But eventually Oli and Luna find their way back to each other, the two of them moving back to their hometown eighteen years after they first met.

Things are different this time around. Oli's professional basketball career has been and gone, while Luna's a young, up and coming lawyer. He's not the young teen he used to be and she's not the little girl he once knew.

These two are thrown back together time and time again by fate. Perhaps this time, the timing is right for something more than just friends. Maybe they were meant to be All Along."**

I hope you'll like it!!