(read premise!) Y/N Geto has spent her entire life refusing to be defined by anyone else. Not by her family name. Not by the dangerous world of jujutsu. And definitely not by Suguru Geto’s overprotective devotion to his little sister. Suguru trusts Y/N’s strength completely. He knows she is capable, stubborn, and more than able to handle herself. He simply does not trust anyone else around her. Especially Gojo Satoru. Gojo has been part of the Geto family for as long as Y/N can remember. Mama and Papa Geto practically raised him alongside their own children. He has his own room at the mansion, steals food from the kitchen, walks in without knocking, and treats Suguru like the brother he never had. Which means he should be off limits. Completely. Undeniably. Unfortunately, Gojo has always been impossible. He is arrogant, reckless, annoyingly charming, and far too good at getting under Y/N’s skin. She sees through his jokes, his confidence, and every attempt he makes to avoid being serious. Gojo sees through her too. Their relationship is arguments that become competitions, missions that become bickering, and silences that somehow feel more dangerous than either. Neither of them is willing to admit that somewhere between childhood and adulthood, something changed. But Suguru notices. And if there is one thing Gojo and Y/N agree on, it is that Suguru can never find out. Because falling for your older brother’s best friend is dangerous. Keeping him secret from the person who loves you both most? That might be worse.