Task: Story Composition
Input (English): Premise: John wanted to have a sleepover. 
 Initial Context: He invited five of his friends and waited patiently. 
 Original Ending: Once everyone arrived, they ordered pizza and ate it. Afterwards, they played with their video games and action figures. John and his friends didn't go to sleep until almost twelve. 
 Counterfactual Context: He invited one of his friends.
Output (English): One he arrived, they ordered pizza and ate it. Afterwards, they played with their video games and action figures. John and his friend didn't go to sleep until almost twelve.