A possible concise summary is:
This is a story of how I became the best friend and business partner of a teenage billionaire who hired me as his assistant. He was arrogant, spoiled and clueless about the real world, but also lonely and vulnerable. His girlfriend Jessica was using him for his money and homework, and I tried to protect him from her. He developed feelings for me, but I rejected him and told him I only saw him as a brother. He finally broke up with Jessica and thanked me with a huge check, which I tore up. He decided to help me with my studies and we became 50/50 partners in his company.
Here are some key facts that I extracted from the text. I numbered them and kept them short sentences.
1. The narrator worked at McDonald's to help her mom pay the bills.
2. Jessica, a classmate, got her fired by spilling soda on herself and blaming the narrator.
3. The narrator's best friend offered her a job as an assistant at a giant technology company.
4. The narrator spilled coffee on the woman who interviewed her and got locked in the bathroom.
5. The narrator got the job because the woman was the boss's girlfriend and he found the narrator funny.
6. The boss was a 16-year-old self-made billionaire who created a successful app.
7. The boss paid the narrator to play video games and watch movies with him, but he was very condescending and arrogant.
8. Jessica was stealing money from the boss's wallet and lying to him about her whereabouts.
9. The narrator tried to befriend the boss and teach him to be more aware of people's intentions.
10. The boss tried to kiss the narrator but she rejected him and told him she saw him as a little brother.
11. The narrator saw Jessica and the boss together again and confronted them.
12. The boss broke up with Jessica and gave the narrator a check for 100 thousand dollars as a thank you, but she tore it up.
13. The boss fired the narrator but decided to help her with her studies so that they could be partners in the future.