Ok, I think this is a really old one, Kagome went back through the well, and she is in college I think. But when she goes she runs into a young girl who looks like Rin, she thinks it may be a relative since Rin was human. But she sees Rin run up to someone who looks like Sesshomaru, and later finds out that Rin has stopped aging, and has gone to school all the way through College multiple times.
I can't remember anymore then that, but if someone could please tell me the fic.
Thank you so much
^_^

I ran across this story once and wasn't able to find it again. :/ Ugh... it's been a few months since I tried searching ... maybe something will pop up now.

-J

I believe you are looking for:

dokuga.com/fanfiction/story/3672/1
No Time Like The Present by animejunky78
Rated M

That's the one I'm thinking of anyway.

Thanks,
-J

HOLY RAGING MONKIES!! thank you so much! have now added it to my fave's
Thank you again ^_^