Task: Story Composition
Input (English): Premise: My niece bought as guinea pig for her ten year old daughter. 
 Initial Context: She bought another one for company. 
 Original Ending: She thought they were both females. She was mistaken, and a litter was born. She was able to sell the babies to a pet store. 
 New ending: At least, she thought it was a male. She was mistaken, and a litter was born. She was able to sell the babies to a pet store. 
Output (English): She bought one male that had been neutered.