I guess you have found these as they are the ones on AO3 but since you don't mention any titles I will just list them:
Observations on Sentinels and Guides in Victorian London (89181 words) by RyuuzaKochou Rating: Teen And Up Audiences Relationships: Sherlock Holmes/John Watson Summary: A Victorian era AU where Sentinels and Guides are members of everyday society. Starring Sentinel! Holmes and Guide! Watson.
Secrets and Revelations (83524 words) by Hisstah Rating: Explicit Relationships: Sherlock Holmes/John Watson Summary: Dr John Watson has some major secrets that he's kept from his flatmate, Alpha Sentinel Sherlock Holmes. Now the Sentinel Tower is after him. Can John stay out of their hands until he can reveal his secrets to Sherlock? (This also has a 200K word sequel.)
Edit: Oops, didn't see that Hisstah's had already been recced. :)
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timeasmymeasure
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Date: 2013-06-23 11:41 am (UTC)Observations on Sentinels and Guides in Victorian London (89181 words) by RyuuzaKochou
Rating: Teen And Up Audiences
Relationships: Sherlock Holmes/John Watson
Summary: A Victorian era AU where Sentinels and Guides are members of everyday society. Starring Sentinel! Holmes and Guide! Watson.
Secrets and Revelations (83524 words) by Hisstah
Rating: Explicit
Relationships: Sherlock Holmes/John Watson
Summary: Dr John Watson has some major secrets that he's kept from his flatmate, Alpha Sentinel Sherlock Holmes. Now the Sentinel Tower is after him. Can John stay out of their hands until he can reveal his secrets to Sherlock?
(This also has a 200K word sequel.)
Edit: Oops, didn't see that Hisstah's had already been recced. :)