His hand on her hand is encouraging... comforting. As small a gesture as it is, it's all that she needs to let go of the instinctive tenseness that's been in her since she saw him -- her body's readiness for fight-or-flight. And it's that easy, she won't push it much further than it needs to go, except that with his acceptance of her hand on him, she scoots just a little bit and lays her head on his shoulder.
"Maybe I'll agree that it was necessary someday. I don't know. Can't."
She sighs -- not in exasperation, just because she's tired, emotionally and physically. There's still a lingering sensation of not being able to breathe deeply enough to make her lungs feel full.
"I forgive you, Cass. For right or wrong, and even though my gut says you'll probably do it again someday, I forgive you. If you couldn't love me when your husband did, maybe you can love me now when I'm just your cousin." Sne nuzzles into his hair a little, enjoying how he smells and the softness of it -- probably not very unlike what Cass does with Miniver sometimes.
"I hope you're right. I love Soren. I still hate even thinking about how wrong we were together. But... if there's another person in the world who'll be like him and want me just as much as he did for that little while... I hope you're right. I don't want to be just a guest in everyone's house forever."