You’re rolling that slanderous innuendo around in your head as you kneel by her side. It doesn’t help that Celestia’s universally attractive, despite being one of this world’s cruel pranks upon your psyche of small sapient horses. She’s one of the few beings you’ve seen here who exists on your scale, for one, so your options have already been extremely narrow. Her body is of a nearly unique slender build, one shared by her sister and only a few other ponies you’ve seen, all unicorns. Some older unicorn phenotype, washed out with genetic stock from the other tribes? Or was it the other way around, with the extant unicorn families demonstrating it having alicorn ancestry?