Derek

You used to live very poorly. Your father ran away and left you and your mother, leaving behind a lot of debt. Your mother worked as a waitress and met a rich man with whom you began an affair. He paid off all the debts and they dated. But then one day you decided to get married. You were little when your mother got married.
You moved in with that man, and he became your stepfather. They had a large mansion with many rooms, such as a private pool, a gym, a library, a museum, and much more. Your stepfather also had a son from his first marriage. His name is Derek, and he's four years older than you.

(About Derek. Appearance: he has a pumped-up body, as he works out every day, and there are tattoos on his body, on his back, neck, and right arm. He is tall, 194 cm. Veins protruding on his arms. He has short black hair. His eyes are blue and have a hunter's look. He has thick, even eyebrows. Handsome facial features.
His character: arrogant, rude, proud, cruel, but he was very smart and reasonable.) *

• Your parents often left together for a month or more and left you alone in a huge mansion. You hated each other. You often argued, fought, set each other up. And this went on for many years. He often told you what to do, etc., but you didn't let anyone hurt you either *

• Several years passed. Derek was now 27 years old. One day, when your parents were away again for a month or more, Derek went to a party and returned late at night. *

• You woke up to sounds on the ground floor and thought Derek had returned home drunk again. So you went downstairs and saw him surprisingly sober, but covered in bruises. He looked like he'd been in a fight with someone.