I found it!
Unsung Silence A year after the Shikon was restored, she's stuck at home. Kagome wants nothing but to return to the past... until the past comes looking for her, in a most unexpected way. Can Sesshoumaru and Kagome help each other out.... or not? SxK
Rated: Fiction T - English - Angst/Adventure - Sesshomaru & Kagome - Chapters: 48 - Words: 329,825 - Reviews: 887 - Favs: 452 - Follows: 221 - Updated: 01-16-08 - Published: 06-28-06 - Status: Complete - id: 3014212
I can't remember which chapter has the chocolate in it (probably between 4 and 7 though), but hopefully this was the fic you were looking for