This was likely from 2005-2008; it's a full modern au, long and slowburn - iirc it spans at least 2 years ic. Everyone is human, and I'm pretty sure that it takes place at a college but there's not much to do with going to classes or learning, more interactions outside of class. iirc Kagome is in the archery club (or has something to do with the archery club, she may not be in it the whole story but I remember a connection) and struggling to figure out her place in the world, Sesshoumaru is in the kendo club and I think he's captain. I'm pretty sure the confession and the end takes place on some stairs in the springtime, but I could be wrong there.

I'm sorry all this is so vague I read this so long ago, but it's been in the back of my head recently and I'm hoping someone knows the one I'm talking about.