In her crystal casing, Usagi slept. But there are some things that cannot be delayed, and so over the course of time, the life her body nurtured grew.
On the planet below, events moved onward. After Usagi's "death", Mina took back the role of leader of the Sailor scouts. With a crescent moon once again on her brow, she claimed that she was the real Moon Princess, and that Usagi had stolen her birthright. With the return of Prince Diamond, Mina's aspirations were proven false, when he demanded Serenity be turned over to him. Upon capturing Mina, he used his powers over the mind to show her the truth of things, and how she, as the Senshi of love, had betrayed her own element.
After Diamond fled, to search the universe for Serenity's next incarnation, Mina returned to the scouts. Knowing now of the crimes she had committed, she bypassed the opportunity given to her to reveal the truth. She continued to claim she was the Princess, and used Diamond's retreat as proof of her power.
The Scouts continued under Mina's leadership, as she continued to consolidate her position by marrying Mamoru. As Proof of her power, the incursions by dark forces ceased not long after Diamond's final incursion.
With Endymion and the others as her enforcers, Mina went onward to attempt to establish her version of Crystal Tokyo.
As Usagi slept, she dreamed. She dreamed about the asteroid that would have caused the Earth's next ice age, and the crystal, reacting to her dreams, nudged it's orbit, avoiding the previously ordained collision. She dreamed of the crystal palace that the Scouts built with their magic. While it was not the future she and the Scouts had saved, the Scouts were happier without the world to take care of. She dreamed of Endymion's devotion to Mina, and of how the two wished for an heir. Distantly, she was aware of her daughter's growth. Inhibited by the crystal, a process that should have taken months instead slowed to years, but as the time of her daughter's birth approached, she was forced to face the reality that while she continued to sleep, her daughter would continue to age.
Embracing her nature, that of serenity itself, Usagi's subconscious used the crystal to make Mina believe she was pregnant, and when the time came, her daughter was transferred to Mina's womb, to be born into a world where she could grow up with her father and her "mother".
As the decades passed, her daughter grew up. The Scouts began to age. As Usagi dreamed, the Scout's lights dimmed, and in a flash of energy, disappeared.
In her crystal chrysalis, Usagi changed. Her already pale coloring faded, her wings grew, and the influence of her second mother's genetics faded completely. She became Serenity, and as such, her memories linked to her past incarnations. Her mind integrated the memories of uncounted millennia, as she finally achieved what Pluto called her "Cosmos" form, which in reality was merely her return to her original state.
For there had always and only ever been one being called Serenity.
As time continued to pass, Serenity's sleep grew deeper, and as the world below changed, her awareness withdrew bit by bit until not even dreams disturbed her slumber.
Until, of course, stubborn force met unmovable object.
