Warning: Rated T for not particularly detailed experimentation, violence and a little gore in later chapters. Szayel/fem!Ishida eventually (mainly onesided).
He pulls himself clear of the wreckage of a human body. It will repair itself in time, he knows, and for this reason he pays absolutely no attention to the ruined form of the girl that will never wake up. She's pretty for aesthetic purposes, of course, but that's all. Eye candy; the girl who will always serve as the vessel for his reincarnation should the need ever arise.
The liquid begins to drain away from the container as he hits the button.
Szayel takes his first step, newborn, into Las Noches, the fluid still dripping from his naked form.