Disclaimer: I don't own Harry Potter. I do go all fangirl over SlightlyNice!Snape, though.
Lily lay flat on her back in the grass, gazing up at the sky. White clouds drifted by and leaves swirled, buoyed by a chill breeze.
"Hey, Sev . . ." she began thoughtfully. ". . . you know what we should do?"
Beside her, Severus turned his head to look at her. "What?"
Lily, too, moved her head to look at him and grinned mischievously. "We should totally prank Potter."
He blinked at her. His eyes were so dark, she thought admiringly. He was surely going to have a million girls after him. She didn't say it aloud, though. He would probably just go all bashful. He was so adorable!
"How?" she realized he'd just said.
"Well . . ." she drew the word out. "I was thinking of, oh, maybe a potion in his drink or something?"
"What would it do?" Sev questioned, a little bit worriedly. What a cutie!
She shrugged. "Nothing too bad . . . an ear goes flying there, maybe a finger rolling here . . ."
Severus looked alarmed.
She cracked up. "Relax, Sev! I was joking, I swear. Well, maybe . . ."
"With you, Lily," He sighed, "I never know."
"You know what they say," she said cheerfully. "'Unpredictability makes the heart grow fonder.' Or something like that."
The next day, Lily went up to James Potter at dinner. He was obnoxious as always. She flirted with him a bit and slipped the potion Sev had helped her make into his drink, then gave her goodbyes and walked back to her friend. They watched him drink from his cup.
"Plan 'Potter Annihilation' is in motion," she whispered.
"'Annihilation'? Lily . . ."
She laughed, patting him on the back. "Don't worry. It's all in good fun! Our fun, I mean. Perhaps not his."
The day after that, Potter's hair reached his knees.
Lily stared. "That . . . isn't quite what I was expecting."
"Wasn't it meant to make his hair grow?" Severus asked.
"Well, yeah, but . . . I didn't expect it to look so good." She stood there for a moment, gazing at Potter thoughtfully, then smiled up at Severus. "It's not as good as yours, though."
He could feel himself flushing. Ever since Lily had cast that spell on him that made his hair deep blue with dots of white that glittered in it, making it look like the night sky, he'd started taking better care of his hair. She'd only taken it off because he'd done that, and also because he didn't like all the attention he'd been getting.
Lily, too, was remembering that episode, and she felt a sudden rush of fondness for her friend. She wove her arm through his and hugged him to her. "We'll be friends forever!" she told him.
Her smile lit his world.