Needle? Of this I am not familiar. We use Milk of the Poppy, it is very effective, I have never had it; I have seen what it can do first hand. Usually the Maester is the one who administers it.
"What does a needle do?" Dany was worried that it might end up in her body. She watches it float over to Eric. For a moment she considers talking Erik out of this, but she thinks better of it. In a discussion she would do what Erik asked her to do.
Khalessi feels like an errant child, except Dany never was one, so the feeling is fleeting.
"Will this hurt?" She looks at him, her trust in his hands.
"I trust you Erik, do not let me down," this was the first time, she outwardly showed her Queenly manner.