okay I'm not sure if this is right but the fic your saying reminds me of a fic where they are all in a business setting, Sess was with kikyo i think and she cheats on him with inuyasha?
SK get together, and kagome pretends to stay with him all the while she's EFing sess like bunnies. They all work in the same building, and Naraku's Rin's "dad" wants her but sends her off to an all girls school until she gets to be about 14.
SK end up together and preggy and break it to inuyasha after they have been together for a year, and are preggy?
^^ that fic is on my alerts list, but it's 1000+fics on that list, and it hasnt updated in so long i cant remember, I dont even know if it was complete. SO i looked on FFN for fics that sound similar, this is what i found so far:
www.fanfiction.net/s/2522091/1/Misery_loves_company
Misery loves company » by Yana D Aristocrat
Kagome witnesses her famous boyfriend of 5 years, Inuyasha, cheat on her with her twin sister, Kikyo. Sesshomaru, as well, witnesses at the same time the infidelity of his girlfriend, Kikyo and acts his usual calm and impervious self. Kagome goes through.
Inuyasha .
Rated: M . English . Romance/Drama . Chapters: 19 . Words: 132,148 . Reviews: 669 . Updated: 2-15-06 . Published: 8.6.05 . Kagome & Sesshomaru . Complete
or this, i think this is it:
www.fanfiction.net/s/3627792/1/Undercover_Situations
Undercover Situations » by Amethyst Water Lily
Kagome is and has been Inuyasha’s girlfriend for two years. She has been keeping a secret from him and that’s his brother Sesshoumaru. She's not the only one with secrets!
Inuyasha .
Rated: M . English . Romance/Humor . Chapters: 25 . Words: 56,848 . Reviews: 244 . Updated: 4.20.09 . Published: 6.30.07 . Sesshomaru & Kagome . Complete