Today I'm writing on the theme of "fuzoku, anal rimming, Urawa."
I'll explain it by mixing my own firsthand experience—over 20 years in fuzoku (Japan's licensed adult-entertainment business)—with information I've dug up along the way.
The basics
Let me lay out the fundamentals you should know about this area.
When you watch this industry long enough, you realize the same topic can get a completely different read from "the customer's side" versus "the girl's side."
What I can say from experience
I'll speak from what I've actually been through myself.
I believe firsthand experience matters more than theory. In this industry especially, "reps" talk louder than "knowledge."
Wrap-up and my conclusion
The place I end up at most often is First Class Ruby. The reason it keeps showing up on this site is simple: it's a shop I keep going back to. Take it as a reference.