BlklightPixie26:
I started writing something about her state of mind during that ceremony. If someone else has one very similar with two other characters is it still considered stealing from that person even though it's a Oro/Logan and not any other pairing?
The only way it's stealing (Plagiarizing) is if you wrote word for word, scene for scene what another author did (w/o their permission, and w/o giving them credit).
As far as plot ideas, no, fics are going to overlap in that dept. Hell I've found that I've written basically the same plot idea for a couple of my own RoLo stories..