To be honest, same. It's a hundred chapters late for them to get married. It was an easy story, but now I'm not even sure what I'm reading ...
I really just want them to get married and get over with. I don't even want to know anymore if Koichi can have kids or not, if they do introduce a "child" plot, Koichi will get kidnapped again, and the child too, and if the child has a nanny, the nanny would get kidnapped too.
Just marry them, please, end our suffering.

This author is adicted to conflict. It's getting so tiresome that she doesn't continue with the actual plot and have been diverting to a hundred sub-plots. AND she has abused the "kidnapping" plot way too much.
This last scene with Kaius and Koichi didn't even feel like "thrilling" or "exciting", I keep saying that the author is throwing sex scenes as placebos.
Now my thoughts are, or author has an editor that's pushing her to extend the story to these crapy extents, OR she's so insecure about actually moving on with the story and marry them because she wouldn't know what to do after it.
Both sucks, though, but the first one is easily fixed. With the second one we might be trapped in this senseless labyrinth for a long time.