Hey! My sister actually told me about this fanfic and basically Lily has a bad fear of heights and never comes to Quidditch Matches but she has a crush on James and he asks her to come she goes to one. And James get hits by something and Lily faints because it's so high up and he gets "mad" at her once he finds out.
Couldn’t find this one. Sound familiar?
Updated 24.02.17 thanks to @harrypotternextgenfacts11! Could this be it?
Title: A Whack In the Head! A Lily and James Story
Genre(s): Friendship, Humour
Word Count: 10,624
Summary: It really all started with a whack in the head. After James’ Quidditch accident lands him in the Hospital Wing, he overhears a conversation from his favorite red-haired angel to her friends and he is Body Brokened. Lily realizes that she does miss Potter and that she feels something beyond rivalry. But is too stubborn to say it. What will our couple do? Is love possible?