All Because Someone Stuck a Post-it Note on a Park Wall

A/N: This was a one-shot a randomly came up with. It didn't leave my brain overnight so I put it here. It probably doesn't make much logical sense (in the case of how the story starts) but oh, well.

Blurb

Someone stuck a post it note on the wall. The chances of those two particular people finding it were minuscule! Well, fate does help sometimes after all.