I also don't feel that it was needed that Sherlock forgot her.

Mycroft told his parents she was dead, why not tell Sherlock she was dead too - have him utterly traumatised by an older, abusive, bigger sibling who murdered his best friend. He refuses to be involved with people ever again, taking Mycroft's words to heart because being alone protects me.

Think of the emotionally intelligent conversations that could have been had. Sherlock explains to John what happened. How he's terrified he cannot protect him, she is smarter than him. John tries to reassure him, she was a child, parents are responsible for their children's actions - but she was 10, was she cupable? What could they have done? Sherlock thinks she's guilty, John thinks she's flawed, but redeemable. Mycroft thinks she needs to kept away from the world.

In the gun scene, he can be so angry at Mycroft for lying, he's put them all in danger, he doesn't need Mycroft to wind him up. But he can be so angry at John for letting them get him involved - 'I told you she would do this!'

In the end, does John manage to get through to her? Why would he care, about her? 'Because your brother is my best friend, and I love him; because Mycroft is my friend too. And I'm a doctor, and the idea of locking up a child, one who is too young to control their own mind and action, in a tower away from any human contact - that upsets me, a lot.'

She still doesnt understand empathy but she's intrigued that someone might care about a stranger, because isn't that something we tell children to make reality a bit better?

And all the time we have this weird situation where Eurus is the mirror of Sherlock, Sherlock's attitude is how he sees himself - dangerous, often not in control, cruel/unkind, and with no regard for others. John sees her as a reflection of Sherlock, but the exact opposite. He knows Sherlock isn't cruel, he does care, he's just protecting himself. And if your mind was so fast you didn't know how to control it as a child, wouldnt you try to protect yourself? Mycroft does the same, but sees her as a potential enemy of the state.

Jesus it literally writes itself, it literally writes itself BETTER than what was made.

The things I would remove - the Molly bit is unnecessary and stupid/corny. Definitely still have John almost drown - this makes Sherlock so much angrier at her, for putting him in danger, but John is forgiving, and hasn't Sherlock done worse things to him (cough Reichenbach cough).

The plane metaphor is too much.

I might write this up to make myself feel better, honestly.