A possible concise summary is:
Grace, a YouTuber, tries to tell her brother Stephen the bad news that she lost the time machine to a masked person. She attempts to catch him during his run, but he is too fast. She then prepares him a breakfast with watermelon, waffles and Gatorade, but he is not impressed. She finally tells him the truth and he is not upset. He gives her a plan to get the time machine back and asks her to send him the files on it.
Here are some key facts extracted from the text:
1. Grace is Stephen's sister and she wants to tell him some bad news.
2. The bad news is that the time machine got stolen by the pink and green masked person.
3. Grace tries to stop Stephen from his run to talk to him, but he is too fast for her.
4. Grace makes him breakfast with watermelon, waffles and Gatorade, hoping he will sit down and listen.
5. Stephen is not upset with Grace and gives her a plan to get the time machine back.