Ah so he turned on you because you were asking around about him / confronted him? I'm not sure if you can ever go back to Underworld. I think people will eventually forget certain crimes but maybe not killing someone. I can't say as I didn't go around upsetting the wastelanders 
As for Dukov's party girls, I did escort one of them to Rivet City but all I got was a karma boost IIRC. No special items or whatever. The quest is timed at five in-game days, after which you can't ever complete the quest. Sounds like you lucked out, but you didn't lose anything significant.
Sydney's gift is a known exploit BTW. You can just keep doing it and getting loads of presents if you want!

As for Dukov's party girls, I did escort one of them to Rivet City but all I got was a karma boost IIRC. No special items or whatever. The quest is timed at five in-game days, after which you can't ever complete the quest. Sounds like you lucked out, but you didn't lose anything significant.
Sydney's gift is a known exploit BTW. You can just keep doing it and getting loads of presents if you want!
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