It is most definitely Winds of Change by KogasAngel (MA)
Winds of Change
Winds Of Change by KogasAngel Reviews
Sesshomaru has made a bet with his friends. He has three months to bed the frigid Kagome and prove that he did it. However, when Sesshomaru comes through, he does something that he instantly regrets and decides to deny that it happened. For Kagome, what happened will stay with her for the rest of her life. A/N please read
Rating: NC-17 - Universe: Alternate - Status: Complete - Genre: Angst/Drama
Updated: 02-01-07 - Chapters: 33 - Reviews 46 - Words 145,372