Hi there!
A while back I read an amazing Yuuri/Wolfram fic, I think it was on fanfiction.net. Anyway, I've been trying to find it again because for some idiotic reason I didn't bookmark it back then.
EDIT2: The fic has been identified by
Iczer6! Thank you so much! The rest of the post has now been placed behind an LJ-cut to avoid spoilers.
The story is
Kiss and Tell by tigersilver.
Thank you so much for hunting this down for me! :D
The main Issue of the story was a huge misunderstanding between Yuuri and Wolfram. After something happened, Yuuri decided that he really did love Wolfram and had sex with him, perhaps in an attempt to prove it. Wolfram didn't object and Yuuri took it as a good sign, when really Wolfram just assumed that Yuuri only wanted his body and was prepared to become a concubine and see Yuuri marry, just to stay close to him.
Neither had any idea about what the other was thinking until Wolfram said something during a sex scene XD
I really enjoyed this story and cried my eyes out while reading it, so I'd be ever so grateful if someone could point me in it's direction.
Thank you! :)
EDIT: a few more things I've remembered:
It is definitely a multi-chapter fic and they aren't together at the beginning of the story. As far as I remember, most of the story takes part in the castle and not off on an adventure/at battle. And I also distinctly remember Yuuri saying "Nice to know I'm not good enough to marry!" and getting angry or something along those lines when things finally come to light (during a sex scene). Wolfram was saying something along the lines of "I'll still be yours" I think... :)
Thanks again!