Task: Story Composition
Input (English): Premise: Joe was at a picnic. 
 Initial Context: And he expecting his friend to arrive. 
 Original Ending: He waited for hours, but nobody showed up. And he ended eating all the food he brought by himself. When Joe got into his car, he saw his friend arrive but left anyway. 
 Counterfactual Context: His friend finally arrived.
Output (English): He had waited for hours, and nobody else had yet showed up. So they ended eating all the food he brought by themselves. When Joe got into his car, he saw another friend arriving but left anyway.