The story title and the (NSFW) tag should tell you all you need to know, but I'm a blowhard so I'm going to keep talking anyway.
This is my first (and probably only) Touhou story to focus on sexuality. It's available to read at:
www.usuallydead.com -> Stories -> Retelling of Oriental Stories -> Story Features -> Sakurei.
I strongly suggest clicking the "Preface" link on that page before reading the story.
To get the disclaimers out of the way:
1. No, this story isn't part of the Ibunshu continuity. This is an offshoot story, taking elements from Ibunshu but not participating in it.
2. This story is
absolutely not safe for work and contains
adult sexual themes! (

) Don't read if you still need Mommy's permission before ordering a movie on Pay-Per-View.
Comment! Discuss! Criticize! Praise! Or don't, either way's cool.