it is never stated what Kazuya is. in the first season it is stated but never fully explained that Kazuya is like a Nova, Pandora, and Limiter all in one. I was hoping season 2 would go into more detail about how he does what he does but it didn't. I hope season 3 goes into more detail about his abilities. Plus I just want to see him man up and kickass.
OVA's are normally not streamed by License Holders to encourage people to buy the Home Video Releases, They are available if you know where to look for them though, and no I won't be listing any sites that are streaming it.
Most people are focusing on the wrong person here. It's not about Louis, it's about Satellizer. He isn't "[getting] off" (poor choice of words there OP) without punishment. It isn't about him. It's about Satillizer and her transformation from being the submissive to becoming the dominant. I believe the choice was poor for the domination to be sexual in type, but I believe that just happened to fit the dynamic of Louis and Satillizer, and the author took the easy way out and got stuck in a predicament.
All in all it was suppose to be just that, a girl crawling her way out from under the boot of a tyrant and becoming the one with the power, not only over herself but over him. It was a transfer if power that was suppose to be a little more dramatic than was depicted. It's literally not David killing Goliath, but David swapping roles with Goliath.
That's just my two cents though, I culd be trying to romanticize it too much.
P.S. I am not making light of the act of rape. Im just discussing the events that followed. I am also not justifying Louis' actions in any way, nor am I saying he has redeemed himself in any way. I am sayin Satilizer now holds his future in her hands and he knows it.