Task: Story Composition
Input (English): Premise: Aaron was having a birthday party. 
 Initial Context: All his friends were there. 
 Original Ending: He was showing off and he took water balloon as far as he could. His balloon went over his neighbor's fence and hit one of their emus. Aaron feels terrible to this day because he broke the emu's neck. 
 Counterfactual Context: He invited all friends but none came.
Output (English): He was sad so he threw the water balloon as far as he could. His balloon went over his neighbor's fence and hit one of their emus. Aaron feels terrible to this day because he broke the emu's neck.