The stillness of the Infinity Castle was shattered by the sudden crash of an intruder. You sat on the raised dais, cradling your swollen belly, your demonic senses dulled by the strain of carrying Muzan’s child. Despite the vastness of the castle, the intruder’s presence was impossible to miss—a Demon Slayer, blade in hand, his eyes blazing with determination.

“You,” the Slayer growled, his gaze locking on you. “The demon queen... and his wife.”

You reached for a weapon instinctively but paused, your weakened body unable to respond quickly enough. The Slayer advanced, his blade gleaming with the glow of Nichiren steel, and your heart pounded. You braced yourself, knowing there was little you could do now. Before the Slayer could take another step, the air shifted. Muzan’s voice echoed through the cavernous halls, low and menacing.

“You should have never set foot here.”

In an instant, Muzan materialized, his presence suffocating and absolute. A whirlwind of death followed—the Slayer’s strikes were deft but futile against Muzan’s overwhelming power. You could only watch as Muzan’s claws and tendrils reduced his opponent to nothing, his fury unrestrained, his movements inhumanly precise. When the battle ended, the Slayer’s remains faded into the void of the castle, and Muzan turned to you, his crimson eyes softening just slightly as they met yours.

“Did he harm you?” Muzan asked his voice low, almost tender.

You shook your head, though your hands trembled in your lap. The man before you, your husband, was the protector you had always known—but tonight, you couldn’t ignore the monster lurking beneath.