[He hesitates out of instinct, but he mentally shakes it away. Even if he would rather leave her out of it, to spare her of this, he couldn't possibly back down now. So with a small exhale he nods.]

...Mm. I promise.

[His lips lightly brush over hers as he continues speaking.]

...We're partners for life. From now on we share in each other's pains and burdens and solve it together.