[Molly listens to it all, and of course it's a good argument. It's coming from Sherlock so what does she expect? And what makes it worse is that he is giving her reasons, and not the flattering lies he's used before to convince her. He's seriously asking this time, for this favour.

He's hurting. He wants to escape the pain.

My mind doesn't work like everyone else's.

Twenty milligrams at a time. He's asked her for five doses. Five.

At least five. Five this time, and how many more after if she says yes?]

Sherlock. I've done a lot for you before. I still would do almost anything for you.

[Almost.]

But not this. Everything you're saying makes sense, and I know that, but it's not--it won't work. Not really.

[Not in the way he'll need.]

I'm sorry. I can't.