Responses
Well SherLiam had a confession scene in the US, then they lived together for 3 years and first thing they do after being back in London is a dinner with all their family and friends.
As for Mycroft and Albert, Mycroft send letters to Albert everyday for 3 years, even though he never got one back. With his character that's not normal, so Albert has to be important to him, as for Albert, the fact that he is verry honest to Mycroft speaks for itself. (Plus they have a "who do you like more mom or dad moment with Charlie in CH.65)
Still funny that the two older Moriarty brothers ended up dating the Holmes brothers and some people still say this series is BL free