Story needs to be completed:
Dennis played the guitar while Matthew played the piano, so

My choice:
Dennis plucked the strings when practicing.

Story needs to be completed:
Felicia always went to the building across the street unlike Emily, because

My choice:
Felicia lived closer to it.

Story needs to be completed:
Robert has amazing silky hair unlike Justin because

My choice:
Justin takes bad care of his hair.

Story needs to be completed:
The family was excited for Brett to visit but not Aaron because

My choice:
Aaron always asked for money.