No sooner were the words of the wish out of my mouth than I was suddenly elsewhere, floating, I realized, well above the earth. I gasped, and clawed at the vacuum, and found I had no need to breath. It was but a moment that I considered the strangeness of this sensation and then my body began to change.
My wish had been vaguely worded at best, so I knew not what to expect, but I should not have been surprised in the least when I felt myself start to grow, my skin stretching and growing hard as I doubled in size, still mostly human though, although after a moment that changed as well.
Six long articulated arms, like those of a spider, burst from my back as I felt my body becoming more feminine, chest swelling into breasts that were small on my enlarged body as my cock shrunk, pulling back into my body as my groin split into a tight wet slit. As I felt the strange sensation of my internal organs rearranging, there was the even stranger flood of knowledge that filled me. As my skin started to pale to pure pure white and an enormous womb-like space appeared around me, I became aware that I was the last of my kind, sent to convert the humans to new members of my race as I saw fit and that I, in the last of the great world-ships, was more akin to god than queen.
Smiling a wicked and willing smile as my spider like legs lifted me from the ground and my hands slide slowly over my small breasts, tweaking the dark nipples and eliciting a spurt of dark milk I set the world ships course for my former home. Earth.