There were many things Sherlock didn’t know how to do, things he never admitted.
How to tie a tie was one of those things.
He managed to make a bowtie, a hangman’s noose, and an origami swan before he threw down the accessory and pouted on the couch. John had offered to help him earlier; he had denied needing help. He was at an impasse: forgo pride and ask for help, or suffer in silence as Mycroft hounded him about why he wasn’t wearing the tie he got his baby brother for Christmas.
The marvelous thing about John was that he knew when Sherlock needed help, even without being asked. He headed over from his spot on his chair, straightened his tall flatmate up, and tied his tie for him, glad to help however he could.
That didn’t mean he wasn’t going to giggle at Sherlock’s expense, though.
“Finally met your match?” John asked with a grin. “‘Sherlock vs. The Tie’. It’d make a good blog post, yeah?”
Sherlock shoved him in the shoulder and huffed all the way to the cab.