Spoiler (click to show/hide):
Fuck it. Retconning her name: Ekah, closer to the pronunciation of 'Echo'. Ece is pronounced like 'eese' as in the last part of the word 'peace'.
As a reminder, both Theresa and Elizabeth have gotten a tummy filling before this.
It's hard to figure out what Diana is after. She seems to be teasing you... but what little you recall of her indicates an exceptionally teasing personality, and you are going to marry her sister soon... Of course, you could always come back and fill her, much like her two sisters who have had a stomach full of your cum.
Ekah is a bit nervous, more at being dealt with on a more reasonable level compared to the normal fear, revulsion, or hatred. She mostly seems to be unsure if she should commit to helping out the humans. Diana would likely push for as much as she thinks she can get away with, but Ekah seems unwilling to trust the human in a position of power, and is leaning on your own experiences as a fellow dragon.