I don’t know how any of this is possible. I don’t know where I am, what this place is, or why the laws of gravity and euclidean physics have thrown themselves out the window. I don’t know what’s happened to me, what I’ve become, or how I’m not dead yet.

All I know is that while I may not be dead, I’m certainly not alive either.

Fair warning, this drifts into Cupcakes-level grimdark-as-f**k territory, particularly at the start.
Non-con tag is due to involuntary body modification and heavy body horror. Gore tag is present for the same reasons. Violence tag is for an implied incident not explicitly spelled out in the text, mainly there just to be safe. No explicitly sexual content.
A stealth crossover with Prey (2006).