It's quite simple, really.

So Ruby is an alien or robot with blood or something cause of the thing in her head, and I'm a were-fox or something that's attacking her. I end up ripping off her leg, and in revenge she rips off my tail. I run away, and we both eat the parts that we ripped off of each other while Ruby makes herself a new leg.

I mean, how could any of that be weird or difficult to understand? It's a tale as old as time!

This is kinda gory. I'm not sure this is SFW guys.