Does anyone remember the fanfic where inuyasha broke up with kagome before they were suppose to head for some vacation, but they still go on the trip with the entire gang and sesshoumaru tags along to. When they reach the place sesshoumaru and Kagome are forced to share a room since the other rooms are occupied by couples. They go to bed after a quarrel and during their sleep they somehow get stuck to each other. They remain like that for the entire trip

I do! It's "Trapped", by sesshou_lover! It's rated MA, as one would expect. The story is a collection of one shots, and the one you're looking for is the second one, and it later has a continuation.
Here's the link:
dokuga.com/fanfiction/story/167/2

Thank you.