Task: Story Composition
Input (English): Premise: Kim was going tubing. 
 Initial Context: Her uncle was driving the boat. 
 Original Ending: The tube went side to side. A few times, it went in the air. She held on tight but eventually fell off. 
 Counterfactual Context: She was floating gently down a quiet river.
Output (English): The tube went side to side as the speed of the river picked up. A few times, it went in the air. She held on tight but eventually fell off.