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(read premise!) Y/N Gojo has spent years being tormented by Ryomen Sukuna. As her older brother Satoru’s ride-or-die best friend, Sukuna has always been part of Y/N’s life: in their shared apartment, at family gatherings, during late-night emergencies, and in every argument he starts just to watch her get mad. He steals her food. Hides her phone. Flicks her forehead. Starts prank wars. Flips her off from across the room. And pays far too much attention to Y/N for someone who insists she is only Gojo’s annoying little sister. Then Sukuna gets a girlfriend. Mika Rei is beautiful, kind, clever, and impossible to hate. She is warm to Y/N from the moment they meet, laughs at Gojo’s ridiculous jokes, and never acts threatened by Sukuna and Y/N’s history. Then Sukuna changes. He still comes over. He still checks Y/N gets home safely. He still steps in when someone makes her uncomfortable. But he stops the thoughtless late-night messages, the familiar touches, the constant teasing, and the pointless arguments that used to make him impossible to ignore. For the first time, Sukuna gives Y/N space. And Y/N hates it. She hates that he asks before stealing her food. She hates that he only nods hello instead of immediately trying to start a fight. She hates watching him save his softer smiles, his attention, and his quiet affection for Mika. Most of all, Y/N hates that Mika has done nothing wrong. Because jealousy would be easier if Sukuna’s girlfriend were cruel. Instead, Y/N is forced to confront the possibility that she does not miss the insults at all. She misses Sukuna. One lifelong rivalry built on pranks, petty revenge, and feelings hidden beneath every argument. One genuinely sweet girlfriend who changes the rules without ever meaning to. And two people slowly realizing that their favorite way of loving each other may have always been a fight.