Yes, this is another help me find the story request.
Uhura has to update or maybe completely re-do the programming for the universal translator. Since Vulcan has a very complicated grammar she tests the newly improved code with Spock and it doesn't work as expected.
There follows a few months of her working in his room coding and testing until everything is perfect.
HEA
That's all I remember, honestly.
Any help would be appreciated. I asked the same in the designated place of the forums, but I don't believe anybody reads those.