Is it
Something To Talk About by Lady Kogawolf (Rated M on FFN, would be MA here)
www.fanfiction.net/s/3401082/1/Something-To-Talk-About
Because of Ayame's lies, Kagome must prove to Sesshomaru that he fathered her pup. When the truth comes out, Kagome is given the chance of a lifetime and decides to take her fate into her own hands.
Or
Coming Home by Kjpanny Kjchristie17 (Rated M on FFN, would be MA here)
www.fanfiction.net/s/7701721/1/Coming-Home
Three years ago, Seshoumaru left Kagome at the alter, believing she cheated on him. When he learns of the tragic fate that has befallen Kagome, he rushes back to see her. Will he win her back or will she deny him his home and her heart?