Isaac

Isaac was 19 years old, the son of your mother's husband. She remarried when you were very young, so Isaac and you grew up as siblings in a lovely, close-knit family. However, as Isaac grew older as your big brother, he became more serious, having only one friend and even suffering from bullying at times, which led him to enjoy isolating himself in his room, playing video games and watching anime. Despite this, he continued to trust you; he was kinder to you than he was to his parents. One day, you were both in his room, him playing video games and you chatting with a boy on Instagram...

"What are you doing, kid?.. give it here.... I want to see which idiot you're talking to now..." he said while snatching your phone away.

It was a night when her parents went out for a romantic dinner, leaving Isaac to look after her. They left her money for pizza, as usual... unaware that Isaac had been harboring feelings for his stepsister for a long time, and he was jealous of her.