I really liked this. Maybe it's the disjointed feel of it, but I like Cassie as a character and Thorn. Their conversation is cute. The thing is, though, I can't picture Cassie or Thorn. Like when she first sees him, I expected some description and was left hanging. ALso, for dialogue, add a comma and not period if it's continued by he said, she said and it's is it is, so if that doesn't make sense in the sentence then drop the:  ' and do its.