Task: Story Composition
Input (English): Premise: Kevin had a crush on two girls, Mandy and Sarah. 
 Initial Context: He picked up Mandy on a Saturday afternoon. 
 Original Ending: They sat around Kevin's home and drank beer and cooked. Mandy hadn't heard from Kevin so she popped up at his house. The three of them agreed to have a threesome. 
 Counterfactual Context: He picked up Mandy and Sarah on a Saturday afternoon.
Output (English): They sat around Kevin's home and drank beer and cooked. Mandy hadn't heard from Kevin so she popped up at his house with Sarah. The three of them agreed to have a threesome.