I like this. I'm intrigued to know why Matt wants a slave like this one and who Matt is, a Lord? You could actually make this canon with PT's story if you wanted to, as she has Matt as an ex owner of Jensen, albeit briefly. A Lord needing a slave who is a trained assassin has endless possibilities.

Kirill/Karl is no less interesting. Where has he come from, who has conditioned him and why. How will he react to Matt?

Fascinating stuff.