Because it's Hentai, of course his work entails sex, sex, and lots of sex, right?
Still, if anything can count as a dream job, this would definitely be it. I guess working his old job at least had the benefit of him being introduced to this one.
Quite a nice ending, too. Makes me want an entire series of this, really.
"Personal fuck puppet..." that's a new one...and I approve. The only thing that would have made this better is if Hoyama (the loli) had gotten involved...I hope there's a sequel.