Since he was a kid, he had been able to control time.

Forgot doing his homework the day before? An hour goes by one minute before class starts.

Having to watch a boring movie with his parents? Speed up time and the film is over in two minutes.

Broke a vase in grandma's house while playing? A glance and the porcellain is back to its place on the table as if nothing has happened.

What he had never thought about was someone being affected by his "time choices".

He only started thinking about it on his first week of university. 

He had just stopped time at the beginning of one of the lectures to go fetch the book he had forgot.

The sudden "Oh , not again!" screamed behind him had been hard to ignore, after all.

That's how the time modifier met the person that had their life constantly influenced by maybe not so random time whims.