Drink the Nuka Acid, and then go to town swallowing anyone that crosses your path. Instead, you will need to find a coveted Nuka Acid to gain access to predatory abilities. The first thing you will notice is that on fresh games, you will no longer be automatically given the Fallout Vore holotape. Many of the core systems that made Fallout Vore have been revisited and changed in a more engaging method.
What is Voremersion? It's a plug in that is meant to be a total overhaul to the wonderful core experience that is Fallout Vore.