Because he had remembered something... something very bad.
He remembered his first life, when he and his Nurgling brothers in Nurgle's Garden had accidentally eaten a kind of... "Pleasure Mushroom" from the Realm of Slaanesh while developing "Grandfather's Surprise Sauce."
That experience had scarred him for eternity.
"Wah... wah..."
This time, baby Fulgrim did not throw up.
He simply... froze.
His pure violet eyes reflected the "not suitable for children" spectacle outside the window. His Primarch's soul, with its relentless pursuit of "beauty," sank into unprecedented... confusion.
He found it... disgusting.
But... there was also a... strange allure?
It was like a gourmet looking at a dish made from the finest ingredients... that turned out to be shit.
"Eh?"
For the first time, baby Fulgrim began to doubt the "aesthetics" he had always believed in.
A soft, seductive voice, impossible to identify as male or female, that could make any mortal go weak at the knees, rang out within their souls.
[Oh, look who we have here! Two lost little darlings.]
Slaanesh. The Prince of Pleasure, the Dark Prince.
[A strong, masculine, perfect body brimming with primal power...] Slaanesh's will caressed Horus's soul like a lover's hand. [And another... oh my, a pure, flawless soul, like a piece of pristine, uncut jade...]
[Come, my little treasures. Stop holding yourselves back.]
[The weariness of battle? The agony of disease? The tedium of knowledge? Forget it all! Join my feast! Here, you will experience the most exquisite pleasure in the universe! The deepest pain! The most magnificent debauchery!]
[I will fill your every breath with orgasmic ecstasy! I will make every inch of your skin tremble as pain and pleasure intertwine! You will become sensation itself!]
Slaanesh's temptation struck straight at the desires in the deepest recesses of their souls.
But Liu