What if Simon Told Clary He Likes Her at Eric's Poetry Slam?

Original Text: City of Bones, Ch. 3, Pgs. 38 & 39
Originally, Simon is trying to open up to Clary about how he truly feels about her, but she leaves to find Jace. What if Simon told Clary how he felt about her before Jace made himself known? How would Clary react? How would Simon react when Clary leaves to find Jace?

This version starts right after the line,
"So, who is it, then?" Clary asked. on page 39 of City of Bones.