I was surprised that Juno won, but congratulations! Here is the Excel Prime.
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The war for the unification of the galaxy had raged for decades. Among the many warriors and strategists guiding humanity through the Great Crusade, few were as formidable and revered as Primarch Juno Guilliman. She was not only a natural leader but also a visionary who had turned Ultramar into a bastion of order and progress.

But even the greatest of commanders had a weakness, a reason for which she would do anything, a line she would cross without hesitation.

Her husband, Centurion.

That immortal warrior, an Eternal who had fought by her side since the days when the Five Hundred Worlds were founded. Her first and only love. The man who, with a simple smile, could make her sigh in tenderness or groan in frustration when he made his crude jokes during formal meetings.

And no one—absolutely no one—would stand between her and Centurion.

--

Juno had taken time off from the Great Crusade to visit her mother, Tarasha Euten, on Macragge. It was a clear day, and the wind gently caressed the palace gardens. Mother and daughter shared an outdoor lunch in the tranquility of their home.

Tarasha watched her daughter, who smiled as she sipped from her cup. But the mother’s gaze was not one of simple pride or happiness—it carried a quiet, lingering concern.

Finally, she broke the silence:

—Have you been able to avoid it lately?

Juno paused for a moment before responding with a sweet smile.

—Yes, Mother. There hasn’t been a need to "eliminate" any flaws in my Legion’s system for months.

Tarasha closed her eyes, exhaling a sigh. She knew exactly what her daughter meant.

Those "flaws" were not administrative errors in Ultramar’s governance, nor logistical issues in the Legion.

They were people.

Women, to be precise. Women Juno had deemed a threat. Servants who vanished, soldiers who never returned from missions… all had one thing in common: they had gotten too close to Centurion. Some with romantic intentions. Others, without even meaning to.

And none of them existed anymore.

Tarasha had tried to warn her daughter before she left for the Great Crusade. She had begged her to reconsider, but Juno always responded with the same icy calm:

—This is all for Centurion’s and my future. Nothing else matters.

But the last time they discussed the matter, Tarasha had tried to appeal to what she believed was left of her daughter’s honor.

—If your father, Konor Guilliman, were alive to see what you’ve become… he would be disappointed.

Tarasha expected anger, a defensive response. But Juno only looked at her with a cold smile.

—That doesn’t matter —she said flatly—. As long as Centurion is by my side, nothing else matters. Even if my dear father had tried to separate us… I would have led the coup that took his life myself.

A shiver ran down Tarasha’s spine.

—I’m glad he never did —Juno continued calmly—. I loved him dearly, and I miss him… but not as much as I love Centurion.

Tarasha’s blood turned to ice in her veins. Juno spoke with respect and nostalgia about her father… and in the same breath, admitted she would have killed him if he had stood between her and Centurion.

—Please, Mother… —Juno tilted her head sweetly—. Don’t try to stand in the way of my love for Centurion. I love you… and I would hate to lose another parent.

It was in that instant that Tarasha understood the truth.

Her daughter was a monster.

And if she tried to stop her… Juno wouldn’t hesitate to eliminate her too.

-Back to the Present-

In the gardens of Macragge, Tarasha sighed, recalling that moment.

—Just try to keep it to a minimum… —she said to her daughter, resigned.

Juno beamed at her.

—Of course, Mother… But I won’t let anything stand between Centurion and me.

Tarasha looked at her daughter, that brilliant Primarch, the hope of Ultramar… and realized that nothing and no one would change the way she loved.

--

The love between Juno and Centurion was no mere infatuation. They were true partners, bound by battle and life itself. But while Juno maintained a flawless posture as a strategist and leader, Centurion had the annoying—and charming—ability to disarm her with mere words.

Like that time, in the middle of a meeting with the human auxiliary commanders of the Ultramarines, when Juno was explaining the importance of order and discipline in the Legion’s structure.

Centurion, with a mischievous smile, whispered under his breath:

—"Discipline and structure," just like you said last night when I tickled you in bed…

Juno choked on her own speech, and her officers pretended not to notice the faint blush on her face.

Then, in a meeting with her mother, Centurion greeted Tarasha in his usual playful tone:

—Mami!

—Don’t call me that —Tarasha sighed with patience, though she couldn’t completely suppress a small smile.

Juno sighed, rubbing the bridge of her nose.

—Centurion… we are in a formal audience.

—So what? —he teased—. It’s just the feared Regent of Macragge, the Empress of Strategies, the mother of my beloved wife…

—Please stop.

—And the woman who definitely hated me at first. Right, Mami?

Tarasha rolled her eyes with a faint smile, while Juno sighed in resignation.

It was true—Tarasha had once disapproved of Centurion. But seeing how he managed to bring out both the best and the worst in her daughter, she began to wonder if his existence was the only thing keeping Juno within certain limits.

What Juno didn’t know… was that Tarasha sometimes felt guilty.

She sometimes laughed when Centurion was around, because with him, she could still see the "humanity" in Juno.

But at the same time, she worried.

Because the Eternal lived in ignorance of the truth. The truth about the woman he so lovingly called "wife."

And about what his beloved "wife" had done for her love for him.