"What happens next?" I LOVED this line!! It's just so... I can't even describe it! It's so completely perfect, and it's like a story, and they are like storybook characters, destined to be together, but at the same time they're not, but in a very indescribable way... Anyways, very good line!
"The only thought that crosses my mind is that I hurt her when I shouldn’t have." AW! That's so incredibly sweet!
"I’m with Sally when I should really be with Casey" YES! YOU ARE RIGHT!
"The look on her face tells me so much more than the words coming from her mouth ever would." Oh, awesome line! How you always manage to come up with these amazing lines, I do not know. I could never be able to do that, but then again, I'm not half as talented as you are.
"Today never happened before." Very good line to end on! Seriously, you're like a machine, coming up with these! Great job :D

“I’m just a girl who kissed a boy who, is in love with you.” It's just like Notting Hill! Sorry, I just absolutely adore that movie!!
"But because I’m Casey I have to tell Sally." Very true, very true!
"...and I was sure he loved her." You were sure. Sure being the key word there!
Anyways, awesome story!! I loved how casey just HAD to go apologize to Sally for kissing her boyfriend, and she got so worked up over it, it's just SO incredibly "Casey"! Wonderful characterization, I loved it!!

I loved it and the end was kinda confusing...

I like how it is.

Nice work.. I would love to see what happens next!

I liked it. I was waiting for more from Casey, more of a declaration of her feelings or something saying that she wishes it were different. I guess, I understand that she was upset by what she had done but I was hoping for a little selfish moment in there. Anyways, great idea, went with the song. I really liked it.

A.

I think its good -- maybe better as a 2-shot were Derek realizes he loves her too :)
but still good!!

no, it was excellent. But, why end it here?
Update soon, hopefully