Detailed Instructions: 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.
Problem:Premise: Tito challenged his dad to a tennis match. 
 Initial Context: He was only 12 and he was sure his dad would win. 
 Original Ending: But he made his dad promise not to go easy on him anyways! Then the two males started playing tennis. To Tito's surprise, he beat his dad! 
 Counterfactual Context: He was stronger than his dad and was sure he would win.
Solution:
But he made his dad promise to play his hardest with him anyways. Then the two males started playing tennis. To Tito's surprise, his dad beat him. 