If 2 was the last one, that ending was kind of lacking. It seemed like they were setting up for more when it came to Luso and maybe even the other dragons. I was kinda looking forward to Luso going nuts and attacking Shagar or something.
There is one last chapter, you can find it on B*to (chapter 12, which would be 13 here, of the korean translation). But yes it's just them being cute and horny, nothing much more to add to the plot
But in my head, Junko sounds like Mandy from Grim Adventures. Meanwhile, the twins sound.like Nagatoro.
If you can get past the first two chapters of Edgar being a bit of a pest, the story is fairly solid.
I would argue it's the first 5~6, but yes, he does get better thankfully