"Wait, You Are Supposed To Put It Where?"
Bilbo finds out that dwarves have zero concept of anal sex or rimming and winds up having to explain it to Thorin, to his great embarrassment. Later, the explanation gets more in-depth and eventually gives both Bilbo and Thorin more than they bargained for.
This began as a comical smut one-shot but eventually took on a life of its own as a massive Bagginshield vs Kilbo love triangle. It has become a tale of love, pining, heartbreak, family, and sacrifice. But there is still smut. I'm still me, damnit.
**This was written pre-Desolation of Smaug, based on the film version of The Unexpected Journey and The Hobbit text**