Actually in His Last Vow, Mycroft is listed as a previous agent---*unsurprised sigh*. // I feel like this is Mark's writing side showing through. "And how about I kill all of your favorite characters and cause more emotional trauma then necessary.
Oh my goodness<<--Heavy breathing indeed. Oh, imagine the purple shirt. I would have loved to have been there when he was trying all these clothes on and him just being like "Nope. My muscles are far too big for this shirt too.