Task: Story Composition
Input (English): Premise: At night time, my mouth was falling open frequently. 
 Initial Context: I purchased a mouth guard in the hopes it would help. 
 Original Ending: In the middle of the night, I awoke with pain in my jaw. I tried changing position several times, to no avail. I finally removed the guard and gave up. 
 Counterfactual Context: I purchased a mouth guard in the hopes it would help and will never have jaw pain again.
Output (English): In the middle of the night, I awoke with pain in my jaw. I tried changing position several times, to no avail. It seems the mouth guard didn't work after all.