Given the task definition and input, reply with output. 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.

Premise: Mack was a large black lab puppy. 
 Initial Context: He slept in bed with me every night, but his gas was terrible. 
 Original Ending: One night, his gas was so atrocious that I moved to the couch to sleep. I could smell it all the way into the living room. Eventually he joined me on the couch. 
 Counterfactual Context: He slept on the couch every night because his gas was terrible.

One night hsi gas was so atrocious that I moved him to another room to sleep. I could smell it all the way into my bedroom. Eventually he joined me in my bed. 