You'll find out at the end!
Glad you're enjoying the game! Vore, I'm not hugely into, so while I might do some soft vore stuff occasionally, it's unlikely to be a big part of the game.
You're allowed to mod it! But it might be difficult to figure out how it works without knowledge of JavaScript.
There is a slave event in the desert now where you can get captured and be sold. Probably won't do being able to own a slave yourself.