Task: Story Composition
Input (English): Premise: Dennis came home to find a big box in his kitchen. 
 Initial Context: It was a new grill! 
 Original Ending: His wife had bought it as a gift. He assembled it and started grilling. Dennis cooked for his family every night on his new grill. 
 Counterfactual Context: He had no idea what could be inside.
Output (English): It was a new grill! He assembled it and started grilling. Dennis cooked for his family every night on his new grill.