Task: Story Composition
Input (English): Premise: My girlfriend, Jen, was a big lover of horses. 
 Initial Context: One day she asked if I would take her out riding. 
 Original Ending: I had never ridden before but I said yes. That day, Jen was so happy, up on her horse. I smiled as I watched her ride, since I refused to mount any horse! 
 Counterfactual Context: I bought two horse for us to ride.
Output (English): I had never ridden before but I was excited. That day, Jen was so happy, up on her horse. I smiled as I rode next to her.