Looking for a Mystrade fic

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I'm trying to locate a Mycroft/Lestrade fic I read (I think) on AO3; they decide to play matchmaker for Sherlock and John. In the process, Mycroft and Lestrade realize their mutual attraction. I only remember bits and pieces but here's what I can recall. Lestrade tries to teach Mycroft to play darts and Mycroft fails miserably at it' Lestrade and Mycroft team up to tail Sherlock and John; they arrange a blind date for Sherlock and John at the opera,where they find out Sherlock knew what they were up to all along.

EDIT: Found! Thank you, mick_gz