That sounds like Ghosts by RosieB

www.dokuga.com/fanfiction/story/1740/1

Ghosts by RosieB Reviews
A nine-part response to the Dokuga LJ comm's Child's Play Challenge. After Naraku's death, Kagome returns to her time forever, where she mourns her losses. An older Sesshoumaru offers a deal - a comfortable and secure marriage in return for a child. After all, they'll never love anyone - including each other - again, right?
Rating: T - Universe: Canon - Status: Complete - Category: Oneshot Collections - Genre: Drama, Romance - Updated: 12-09-09 - Created: 03-05-09 Chapters: 9 - Reviews: 53 - Words: 28,991 - Reads: 40,978 - Anonymous Reading: Yes

Ugh for the life of me I can’t remember if I read this here, but Kagome meets Sesshomaru in the present time and they agree to marry each other, all she asks of him is that he help her fall in love with him by kissing her once a day. I think it leads into Kagome doing charity work and fundraisers, etc. Thanks in advance!

YES! Thank you so much!!!