Sherlock's violin and Euro's deduction: "Oh!"

 (Sherlock meta by Ivy Blossom)

Q: Just how do you relate the violin to Sherlock's lack of virginity or possible awareness of his own sexuality? I just couldn't findd the sexual part of it, thought it was more of an understanding and acceptance of how he would not leave her

A: When Sherlock first plays his own composition for Eurus, she interrupts him, surprised, and says: “Oh! Have you had sex?”

Either this is just a non sequitur, or listening to Sherlock play just a couple of notes gives her new information about him. The “Oh!” suggests it’s new information that has surprised her.

Eurus has spent a fair bit of time with Sherlock, and she is a Holmes, the Ur Holmes, in a way. She is able to deduce better than either of her brothers. She spends a night walking around London with Sherlock, and while he thinks he is keeping a suicidal Faith company on a “danger night”, in fact Eurus is discovering all kinds of things about him. She finds him to be sweet, and much nicer than she expects him to be. I can’t imagine there is much she doesn’t know about Sherlock at that point.

When Sherlock comes to Sherrinford and plays her violin, her first reaction is surprise. “Oh!” Not that he can play; she knows he can play. “Oh!” suggests she’s deduced something new. “Have you had sex?” suggests that she has deduced, somehow, that he has.

Sherlock, in keeping with the firm ambiguity of the entire series, neither confirms nor denies it.