Aine hates it when he talks into her mind. It's bad enough that she has someone else holding sway over her very life and soul.
But she has no way to respond to him feeling like he can share anything he wants into her mind. So instead she ignores the Dragonborn. Almost.
She can't help herself, and instead conjures the image of a ring in a box floating in the air in front of him, reminding him of his own discomforts.
And then she readjusts Harold's arms into a far more intimate position, and carries on.