I believe there should be more content for Keirys as he is described as having being somebody you don't mess with and he has regained a lot of power since his downfall.
However he has only just made his debut in this game and it remains to be seen, just how much power and influence he truly has.
Be patient, I'm sure that Xperiment the game developer has more interesting Keirys content planned and hopefully that will include some NSFW content too.