Infatuation: A foolish or all-absorbing passion.
Sometimes James thinks he can sense through walls, where Lily Evans walks, follow the trail of awesomeness she leaves, the smell of her shampoo and the sound of her laughter.
Sometimes, James looks up, in the middle of a joke or laughing with his mates, and sees her, green gaze piercing him, red hair swinging as she turns her back, soft lips curling, eyes narrowing, contempt and superiority and hatred in her inexplicable jade expressions.
She always leaves him speechless, the punch-line of his joke lost, mouth open, transfixed by her movements. It doesn't matter that she loathes him. It doesn't matter that she hits him when no-one else bothers to. All that matters is that she is the girl he wants and can never have, she is Lily Evans and she is hot.
Once, in Fifth Year, James is walking past the Prefects bathroom and sees, through the crack of the slightly open door, Lily Evans in just a towel, steam curling her hair into wispy ringlets around her ears, massaging moisturiser into the freckled skin of her leg.
He walks on before she can look up and see him, and is late for Charms that afternoon because it is imperative that he have a mighty wank or he might actually explode.
When he finally gets to Charms, Lily turns with the rest of the class to see who has come in. James sees it in her eyes, it is not James Potter standing there, closing the door behind him, it is a vile worm.
But even as she throws her acid looks at him, he is admiring the set of her shoulders in the white blouse, her blue bra, translucently visible, and how she's pulled her hair up, in a pale green clasp, so that some of it falls down around her delicate ears.
By the time James reaches his seat, he's thoroughly in need of a wank all over again.
Lily Evans…
