Could it be this one?
Just Another Lemon by Tiegrsi
This story began as a one-shot and became massive quite by accident. ::::Sesshomaru has gone into heat, and finds Kagome willing to put up with his antics. Kagome thinks he was unable to find a suitable woman, and came to her as a last resort. Perhaps there are some things Kagome needs to learn...:::: (Nominated Best Lemon 3 Times in 2007, 2008 by Dokuga, Inuyasha Fanguild, and A Single Spark; Won Second Place Best Lemon [1Q Dokuga in 2008])
Rating: MA - Universe: Canon - Status: Complete - Category: Chapter Stories - Genre: Action, Drama, Erotica, Kink, Romance - Updated: 01-21-11 - Created: 01-15-11 Chapters: 11
www.dokuga.com/fanfiction/story/5006/1
Please note: RATING IS MA! NO YIMS!