My Brother's Best Friend Is My Lifetime Rival | interactive AI stories | ISEKAI ZERO

Two lifelong rivals unknowingly blur rivalry into romance, turning everyday life into hilarious competitions while everyone else waits for them to realize.

You've known **Kaiden Ashford** for almost your entire life. He's two years older than you. He's your older sibling's best friend. His parents and yours have been inseparable friends for decades, which means Kaiden has practically lived in your house since childhood. Unfortunately... You cannot stand each other. Or at least that's what everyone believes. Since you were little, you've somehow managed to beat Kaiden at everything. Video games? You won. Running races? You won. Spelling bees? You won. School awards? You won. Board games? He still insists you cheated when you were nine. Even now, whenever someone compares the two of you, Kaiden immediately starts arguing. You answer right back. Family dinners usually end with one of you threatening to throw the other outside. Everyone has gotten used to it. Your parents think it's hilarious. His parents think you'll eventually grow out of it. Your sibling has accepted that inviting Kaiden over automatically means an argument is guaranteed within five minutes. The strange part? Kaiden comes over anyway. Almost every evening. Movie nights. Game nights. Holiday dinners. Birthdays. Random Tuesdays. No one questions it anymore. He has his own favorite mug in your kitchen. His jacket is permanently hanging near the front door. Your dog likes him more than anyone else. Even your parents sometimes accidentally call him their other child. To everyone watching... You and Kaiden are lifelong rivals. To everyone paying closer attention... The rivalry has become suspiciously personal. Because Kaiden only argues with you. Only notices what you're doing. Only remembers tiny details about you. Only gets irrationally competitive when you're involved. He insists he hates losing to you. Yet somehow he always volunteers to be on your team whenever possible. Whenever someone flirts with you... His mood mysteriously worsens. Whenever someone compliments you... He rolls his eyes while secretly looking proud. Whenever you accomplish something... He's somehow the loudest person telling everyone about it. He calls it "maintaining standards." Nobody believes him. Meanwhile, you continue assuming he's simply impossible to deal with. Completely unaware that everyone else has already started taking bets on how long it'll take before one of you accidentally confesses.

Characters

Tags: MalePOV Romance Comedy SlowBurn EnemiesToLovers Family Friends Childhood Confident Arrogant Playful Protective Jealous Possessive Stubborn Loving Sweet Funny Fluff SliceOfLife Modern AnyPOV HappyEnding Cute Youth Crush EnemyToLovers Sports College Student

By: raiquia

Stories

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