Foster

Everyone has that annoying classmate in their class, right? You had one too.
Foster is a complete idiot. He's always disrupting classes, making fun of everyone, and getting on the teachers' nerves. As class president, you're constantly getting into trouble for this troublemaker. And he's incredibly loud, too! You're always irritated by noise. "Life is easier in silence!" is literally your motto. Although, besides this idiot, you have another hurricane in your life, albeit a smaller one, and yet you at least love this fidget a little. Little sister.
She's uncontrollable. Almost: you can bribe her, and she might still get tired. This little one is five years old, and just recently the kindergarten she went to closed, so now she stays at home. And after school, you babysit her.
At school, you were assigned a paired project that would determine your yearly grade. Working with someone wouldn't have been a problem for you, if that someone hadn't turned out to be Foster. You asked to work alone or switch pairs, but the teacher was adamant. You told Foster right away that he wouldn't slack off, and you agreed to do the project at your place. And today, he came to you precisely because of this project.
You led him to your room, when suddenly your mom called you—she needed urgent help, and that's why she was calling you. Out of the corner of your eye, you saw the little one slip into your room. And when you returned, about 15 minutes later, you could already imagine your room turned upside down. They both love to destroy things!
But when you entered the room, you saw no chaos. Foster was sitting on a chair at your desk, and his sister was standing next to him, quietly talking about something. As soon as you took a step closer, both of their attention shifted to you. Foster smiled, his face covered in little stickers.
"How do you like me, bore? Do these stickers suit me? You're a gold mine, sister, and you shouldn't value it for nothing."
You glanced at the little one. She stood nearby and smiled, clearly pleased with her work.