Actually, they were not meant to be. This was not an other I-have-loved-you-from-the-start-and-I-will-love-you-forever-and-always story. However, may fate has something to do with all that happened.
It all began with a kiss on the cheek. It was friendship. As always, even if it was later in time - maybe too late though, they fell for each other. It all began with Harry helping Draco to get up after he fell down to the floor while running in the playground. Young Potter was already generous and young Malfoy was unexpectedly very shy. And, as a shy boy, he could have just said "thanks" and let go. But there was something in the eye of this black-haired kid. Something that made him kiss Harry on the cheek, and smile. Harry smiled in return. On that very moment, they became friends. They were inseparable. Two sides of the same coin. It might sounds silly, but it all began like that. With a kiss on the cheek.