Problem: Continue the following story.

Justin changed Derrick's tires on his new car, after that, 
Here's how I want to continue it: Derrick paid him for the parts and labor.

Problem: Continue the following story.

Ian's pants are way bigger than the ones that Robert wears. 
Here's how I want to continue it: Ian is a fat man.

Problem: Continue the following story.

Aaron needed help from Samuel with their diet since 
Here's how I want to continue it:
Samuel remembered what it was like to be overweight.