I don't know the specific one you're looking for, but here is a polyglot!John fic in the BBC verse:
Common Tongues: Unassuming Brilliance (41156 words) by jinglebell Chapters: 11/11 Fandom: Sherlock (TV), Sherlock Holmes & Related Fandoms Rating: Explicit Warnings: Author Chose Not To Use Archive Warnings Relationships: Sherlock Holmes/John Watson Characters: Sherlock Holmes, John Watson, Mycroft Holmes Additional Tags: Johnlock - Freeform, Anal Sex, Rimming, blowjob, Snowballing, gratuitous description of cock and the sucking thereof, Language Kink, Genius!John, like seriously major language/intellectual competency kink if that is even a thing, I made it a thing, it'll be YOUR thing too by the time I am done with you, BAMF!John, Size Difference, Height difference, sapiosexual!Sherlock?, size queen, Bareback Sex Summary:
John may be predictably average in most things, but there are a handful of areas in which he knows he is uncommonly skilled. He can make a great cup of tea, for one. He's also good at patching folks up, putting bullets precisely where he wants them, and listening.
The one skill that John is perhaps most exceptional in, though, is language. John is a polyglot.
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timeasmymeasure
no subject
Date: 2014-09-28 04:59 am (UTC)Common Tongues: Unassuming Brilliance (41156 words) by jinglebell
Chapters: 11/11
Fandom: Sherlock (TV), Sherlock Holmes & Related Fandoms
Rating: Explicit
Warnings: Author Chose Not To Use Archive Warnings
Relationships: Sherlock Holmes/John Watson
Characters: Sherlock Holmes, John Watson, Mycroft Holmes
Additional Tags: Johnlock - Freeform, Anal Sex, Rimming, blowjob, Snowballing, gratuitous description of cock and the sucking thereof, Language Kink, Genius!John, like seriously major language/intellectual competency kink if that is even a thing, I made it a thing, it'll be YOUR thing too by the time I am done with you, BAMF!John, Size Difference, Height difference, sapiosexual!Sherlock?, size queen, Bareback Sex
Summary:
John may be predictably average in most things, but there are a handful of areas in which he knows he is uncommonly skilled. He can make a great cup of tea, for one. He's also good at patching folks up, putting bullets precisely where he wants them, and listening.
The one skill that John is perhaps most exceptional in, though, is language. John is a polyglot.