Task: Story Composition
Input (English): Premise: Gavin had planned a surprise party for his cousin. 
 Initial Context: He told everyone to be at his house early. 
 Original Ending: Gavin got everything ready for the party. Everyone waited for the cousin. When Gavin's cousin showed up, he was quite surprised. 
 Counterfactual Context: He told everyone to come to the house late.
Output (English): Gavin got everything ready for the party. Everyone waited for the cousin, knowing he always shows up very late. When Gavin's cousin showed up, he was quite surprised.