There are femdom stories aplenty at this site. If you do an advanced search and click yes by all the F/whatever stories, you will find an inordinate amount of things for your reading pleasure.
As for wanton violence toward women, I prefer the violence to have something to do with the plot at least. Not just someone whacking the heads off women or torturing them just to prove they can.
I realize my story "Rose Takes a Day Off" is quite violent toward Rose, but she's learning to shut her mouth, too. My violence tends to help out the story, not just hurt the woman.