Simon x Derek

This is my fist story
This story takes place after the episode where Simon gets bullied by Derek for wearing his spare glasses after Alvin broke his original pair. At the end of the episode everyone sticks up for Simon when he is getting bullied by Derek and Derek puts him down, the chipettes then invites everyone to their house for a party and they all run to their house. Simon then turns around and invites Derek to the party. What happens next.