I'm Not Innocent

Francesca Baker is a girl you'd most likely find sitting in the corner of the library reading science-fiction books, or at home watching chick-flicks and eating tubs of ice cream.
That is, until she rides Mount Disaster, the tallest roller-coaster she's been on, and will be going on for a while. Why? Because Francesca accidentally pukes on Ryder Stone, the town's bad boy.
So she's forced to help him clean up the mess, and he's being an ego-istic di*khead. They obviously don't get along very well.
After that, they keep bumping into each other everywhere they go, and trust me, that gets annoying.
Soon, the line between lovers and enemies isn't clear anymore and both are confused as to where they stand, and why.
So what happens?
That's for me to know, and for you to find out.