Okay so this one someone might remember. At least I hope.
It is Cannon Based fic. It is after epic battle against Naraku. Kagome and Sesshoumaru are trapped into the shikon Jewel, and if I recall correctly it is rather large and placed were Midoriko was sealed. Anyways, it is discovered that if Kagome and Sesshoumaru have sex and make a child(not sure on the child part) that they will be released. I can't remember what made it happen but Kagome hides herself from Sesshoumaru inside the jewel. They do have sex and they do get out.
I believe Rin and Shippo talk to Sesshoumaru through the jewel maybe once or twice? I might be wrong.
Please help?
I would appreciate it!
<3