Anon spends all of his bits on Berry Punch's Alcoholic Punch and is pushed by Twilight into finding a job. Starlight suggests that he works with Trixie as an assistant for her magic practice. Anon believes this should be easy enough and agrees. After practice Trixie demands praise and Anon gives her scritches. Then Twilight asks for scritches and she gets scricthes, and this upsets Trixie.

By all means this description does not mean this story has a plot, or can even be considered a story. I'm not sure if that makes this a spoiler or not, but I'll mark it as one just to be safe.

Kind of like a prequel to Anon Gets a Job at Ponyville Spa, but I'd be a liar if I called it that.

Dinky’s assignment is to describe somepony who she believes she knows very well using 500 words or less.  That pony will also have to write a description of themselves in 500 words or less.  

The point of the exercise is to help the young fillies and colts think about the ponies in their live and to encourage them to share what it is that they feel makes somepony special.  

Having chosen to write about her mother Dinky borrows her mother’s unused words to try and describe her and ends up learning something in the process.