It is obvious to anyone with eyes.
They've been drawn together by an invisible string as long as they've known each other. After all, opposites attract, and these two are as different as can be – Dark and Light, blond and brunet, snake and lion, Slytherin and Gryffindor. Even their names are the antithesis of each other – Harry, a common, solid name; and Draco, an aristocratic, upper class one. One evokes warmth and comfort, the other, elegant parties and snobbery.
Yet they are perfect for each other. They always have been, ever since they met. Only Draco can truly challenge Harry, bring him to life – and Harry has always played the same role for him.
And, as the years pass, they change as well. The loud fights turn to flirtatious bantering, avoiding each other at every cost somehow leads to touching each other at every chance. Childhood enemies somehow become the best Auror team in living memory.
Yes, everyone knows that it's just a matter of time before the two stars clash into each other, finding themselves and a relationship written in the threads of fate. It's only a matter of letting them figure it out for themselves.
Everyone knows it exists – they're just waiting for this knowledge to be discovered.
A/N: I'll probably expand upon this on a later date :)
For:
The Alphabet Soup-Drabble Competition, H is for Higgs-Boson: Something everyone knew existed for a long time before it was actually discovered
The Latin Challenge: Celo
If you dare challenge, Prompt 154. Discovering America
OTP Bootcamp, Prompt 45. Patience