What I remember is: Inuyasha is an asshole to Kagome for no reason in the beginning he doesn't even realise he was doing it. Kagome was essentially immortal and Sesshomaru was her mate. Inupapa came back and thought that he needed to help Sessh only to find out that it was Inuyasha that needed his help as well as Byakuya, who was brought back with kagura and Kanna. Miroku joined the pack after he told Sesshomaru about his devotion to Kagome.

Soundx like Wandering Ways by Marina Lenore (M on FFN would be MA Here)
www.fanfiction.net/s/11676784/1/Wandering-Ways
At the final battle with Naraku two unexpected things happen - the first being Naraku shattering the Shikon just before his death, and the second being a forging of a connection that nobody could possibly have predicted. Well, nobody except Miroku, that is. Complete.

Thank you so much!