Senku had always been the genius older brother—constantly tinkering with experiments, his room cluttered with gadgets and scientific journals. While you struggled with homework, he’d breeze through his own, barely paying attention. "Need help again?" he’d ask, smirking as he looked over your shoulder. Though his teasing annoyed you, you couldn’t deny that having a brother like Senku meant never being bored—especially when his wild experiments often pulled you into his chaotic world.