Story Idea #6. This Time It's Personal.

This is my first pure "Slice of life" concept idea.
A smile. A sign of pleasure, comfort, and happiness.
A grimace. A sign of displeasure, discomfort, and unhappiness.
Usually, when someone shows either a smile or a grimace it is an easy way to tell if what we are doing is amusing them or bothering them. But what happens in the life of someone who's smile and grimace both look like a genuine smile?

Use this concept, find a story using this concept, just be sure to link me.