So I can't find this fic for the life of me and I would greatly appreciate any help

Okay so the basic premise is Sesshomarus mom blackmails Sesshomaru to mate a full blooded demon but can keep Kagome(?).
Kagome gives birth to many children but Sesshomaru keeps taking them away. Two of her kids are curious about the shed they are not supposed to go near. They open the shed and find a woman in there not knowing who she is. Later both of them go into sesshomarus study and find a journal that explains the events and they lady in the shed. At the end the kids kill the demoness because she stepped in the nursery(?) where only the children control the room, it's their territory basically, they're reunited with their birth mom and I think Sesshomaru kill his mom for stepping out of line.
I don't remember the rating. Thank you for any help

I believe you're looking for In the Locked Hut by LibraCourt, it's rated T.

www.dokuga.com/fanfiction/story/11107/1

It is! Thank you