Task: Story Composition
Input (English): Premise: I had gotten a stink bomb from my cousin. 
 Initial Context: My plan was to set it off in math class. 
 Original Ending: When nobody sat in the desk I rigged up I got impatient. I went to talk to my friend as a way to hide breaking the vial. Within ten minutes we had to evacuate the class. 
 Counterfactual Context: I forgot  to set it off in math class.
Output (English): When nothing happened at the desk I rigged up I got impatient. I went to talk to my friend as a way to hide breaking the vial. It took me ten minutes to realize I had forgot to set the vial.