Short green

>It wasn't clear at first; neither mare gave much thought to the younger sister's de-aged state when Luna returned and was freed from the Nightmare.
>The alicorn sisters were simply glad to have each other again.
>No, it wasn't until that spring that the two realized what had happened.
>Luna went into heat for the first time in thousands of years.
>It was impossible.
>She had hit menopause millennia ago.
>And yet here she was, an almost forgotten itch burning at her loans.
>A quick trip to the medical wing confirmed it, and some more in-depth examinations revealed the surprising 'why'.
>When Luna had first been banished to the moon, it wasn't as her physical self.
>No, the Elements had quite literally converted her body into pure magic and bound it within the space rock.
>That is why the Mare in the Moon appeared cratered across the lunar surface.
>And when Nightmare Moon returned, her body was reconstituted.
>Not exactly as it was, however, for if a body is being reconstructed from pure magic, why would it maintain the damage and wear of its predecessor?
>By all rights, Luna's body was new; a copy of what she once was, but lacking all the scars and imperfections garnered over a lifetime.
>And with ovaries restocked with healthy ovum.
>It was nothing short of a miracle, and one Celestia was guiltily envious of.
>Her sister was never the maternal sort, preferring to watch over the foal of others in the dreamscape rather than birth her own.
>A complete opposite of her sister, who, before hitting menopause all those years ago, had foaled nine little ones of her own.
>Still, there was nothing to be done about it, and Celestia was willing to let her sister squander her gift if that is what she so desired.
>... Until Anon came along, that is, and asked for a foal of his own from the solar monarch.
>Now Celestia is begging, pleading with her sister to bare a foal for her beloved, for if she cannot provide one of her own, than her sister was the next best option.