Lily/Snape.
She came to play on the park with her dreadful sister every afternoon at four o'clock. She'd run over to the swings first, her glorious red hair flowing in the light summer breeze, then she'd move over to the monkey bars, then it was time for a quick go on the slide, then finally she and her sister would take turns spinning each other on the roundabout.
Severus always watched this routine from the shadows of the bushes, always longing to run out and join them. But he knew it was better to bide his time. Besides, he didn't mind standing around watching. The girl fascinated him.
It was a week before he learnt her name. He found it remarkable that it took that long for her sister to say it. He knew her name, the red headed girl had said it many times before. Petunia, it was, which Severus wasn't very keen on.
Her name, however, he adored.
"Lily!" Petunia screeched one day, watching as her sister made a rock skip across the tarmac without even touching it, "Stop it! You said you'd stop all of that. You promised."
Lily. It was so perfect. So her.
The name was stuck in his mind for days.