A few suggestions. They all use the Search tool.
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1. Check out the Boston Buzz boards and posts that emphasize that the Provider enjoys duos with her friends. I.e., use the Search tool for "duo" "friends" "girl friend" and related terms. MANY recent / current hits!
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2. Search Reviews for "Location: Boston" and "Will bring second provider: Yes" . Add other filters (age, ethnicity, etc.) to narrow things down to your preferences. [EDIT: Many touring Providers might have Duo reviews in other cities but be available for duos in Boston: LEAVE OUT LOCATION to get all of their duos!]
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3. Search the Reviews NAME field for "&" : That will return doubles reviews for all "Name1 & Name2" duos.  
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4. Some reviewers enter their duos reviews as "Name1 AND Name2". You can search NAME for "and" but that will return a lot of false positives such as cANDy, mANDy, ANDrea, Mary CallANDria, and so on. But you might catch some good "Name1 and Name2" true positives. Request to Duo Reviewers: In the NAME field, use "&" and not "AND"!!!  
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5. Search Reviews NAME field for "friend" which will deliver hits such as "Name1 and FRIEND" or "Name1 & Friend" (when the Reviewer used "friend" instead of the actual "Name2). You  might also get some false hits for "Friendly Frieda" and similar.
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6. Search the Boston Discussion board for "FMF" (implies M in between two Fs, your preference) but also for "FFM" or "MFF" (which implies a lot more FF action).  And also try searching for "duo" or "threesome" and so on.
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Obviously, for ALL of the above, check the dates for freshness. A great "&" duo review from 11 years ago is kind of stale. A Buzz Board post with a hot provider and her hot friend from 9 years ago might be stale.  
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Good luck! Good luck!

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yessss! i love topics on this and Im about it

As mentioned on your other post in the New England board. Recently offered duos.
I would also think you could talk with BI

Natalee Raye and myself will be offering Duos in Waltham this week!!!

I would love to join you and your lady of choice when I visit in September! Or I can help choose a third for us.

Hot Tri-State Duo Looking to Travel to Boston

My Duo Partner and I have been in talks of a Boston Trip for quite some time - I'm based in NYC the remainder of July and she is based in RI.  
We would love to treat you right and give you the time of your life!  

If you'd liked more pictures and to know our rates, please contact me by email.
[email protected]

Coming back with Eve from 8/17 to 8/22 — ready to cause a little trouble. 😉🔥

Look at Aiza and Eve in Boston.  They both have amazing chemistry.