Hmm... Runa would probably have a club job of some kind. Waitress or bartender.
Well... Yuuko would probably work as an 'artist'. She's good at it, it's something she enjoys doing, and we've firmly established that the two of them are twisted enough to come up with plenty of ideas. Of course they wouldn't make too much money, but as long as they aren't out on the streets I think that the pair would be pretty happy. They are rather anti-materialistic yet hedonists after all. I also get the feeling that Yuuko will eventually get a mid-life crisis and leave Runa for a while, before she comes crawling back because she's the only one who has made Yuuko happy or something treacherously sweet like that.
As for kids with them... Adoption of a girl just as crazy as they are? I feel a lot of weird things would happen if they had a child... all three together comes to mind...
(Japan, Age of consent be 14 so... not AS creepy? I don't know... any rendition of Not!Selina always goes weirdly.)
That'd be... A definite thing. Which will likely never happen because the adoption agency would take one look at their life and reject them quickly. It'd be pretty obvious that any kid left in their care would turn out to be just as dysfunctional as they are...
All of this is assuming that Yuuko doesn't end up in jail for killing/trying to kill her father, of course. Which is a thing that could happen and I have definitely been hinting at, especially when the RP completely stopped for several months.
...
I'll probably make happier characters for the new thread. Or at least ones who aren't so pointlessly crazy. Then again, I did make Yuuko to pair up with Runa specifically...