I Think that you are talking about Second Alliance by Imani Joain
www.dokuga.com/fanfiction/story/8948/1

A new threat has breached the peace left in the wake of Naraku's defeat. This time, it will be Sesshomaru who must propose an alliance to defeat an enemy he has no experience with: a death that claims humans and demons alike. Only his half-brother's strange miko truly understands the danger, and she is the key to conquering it. Originally posted on fanfiction.net. Revised edition here. 2nd Semi-annual 2013 Dokuga Awards: Best Canon, 1st Place; Best Kagome Portrayal, 1st Place; Best Sesshomaru Portrayal, 3rd Place; and Best Darkfic/Horror, 3rd Place. Nominated for Best Romance. October 2014 Feudal Association Awards: 1st Place Best Drama Fiction.
Rating: MA

I cant Remember if I have Asked Before But Im looking For A Fic Where Kagome helping sesshomaru fight a disease that was released by another lord and in the fic she melds her aura with sesshomaru to fight the disease from the inside out, she is also taking care of a baby dragon. I think it's set after the jewel is wished on.