Task: Story Composition
Input (English): Premise: I went to a sushi bar. 
 Initial Context: The sushi chef told me that I should try some fatty tuna. 
 Original Ending: I agreed with him. He handed me a freshly-cut piece of fatty tuna. It tasted horrible! 
 Counterfactual Context: The sushi chef told me that I could try some crab.
Output (English): I agreed with him. He handed me a freshly-cut piece of crab. It tasted horrible!