Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.
Q: Premise: Dan recently asked his teenage son to help him mow the lawn. 
 Initial Context: The teenage quickly stated that he had homework to do. 
 Original Ending: Dan, believing the excuse mowed the lawn himself. However, when Dan went to check on his son, he was asleep. Dan realized that he had a lazy teenager on his hands. 
 Counterfactual Context: His son quickly agreed to mow the lawn.
A: 
Dan believed the lawn was mowed. However, when Dan went to check on his son, he was asleep. Dan realized that he had a lazy teenager on his hands. 