Task: Story Composition
Input (English): Premise: Leo had just removed the training wheels from his bike. 
 Initial Context: He set off wobbly on two wheels. 
 Original Ending: Then he crashed and toppled over! Leo wanted to cry, but he decided to be a big boy. He got right back on his bike and pedaled off! 
 Counterfactual Context: He let his sister ride on his bike while her bike was being repaired.
Output (English): Then she crashed and toppled over! Leo's sister wanted to cry, but he decided to be a big girl. She got right back on the bike and pedaled off!