'Owe' was perhaps the wrong word but there was a feeling he could only place as guilt about what he had done. "Cersei, he was ten. A boy of ten and from him I took his future. I know he'd climbed. I know he'd needed to be silenced but it would have been so much kinder if he'd just died. So yes if I can take Arya Stark in and help her, then I will do so." He was probably the more noble of the two. Ironic for the man they called Kingslayer. But as a Lannister he had certain reputations to maintain, and to his sister a loyalty that could never be broken. "Yes, you're right. We could use her if her family show up here. It would be good for her to learn from people like us and not the lies and treachery of her family. If you are agreeable then, we keep the girl with us."
Joffery, of course she needed to see him. Of course she did. "He understands as much as I could explain but it is you he will need to hear it from. He'll need to know why. He'll need to understand the truth of his parentage for what it is. That we belong together." He hated to see her like that, so hurt, broken and without a plan. "Don't cry sister please don't. You are a Lannister of Casterly Rock, you are the rightful Queen of Westros and you are strong. You are proud and you are going to be as powerful here as ever you were. Do you understand me Cersei?"
He knew her, he knew her so completely, and his sister was hurting and lost and confused and she needed him. He would calm her. He took her arm and led her down the street trying to get to their home as quickly as she possibly could. Unless, "Cersei follow me." he told her, leading her down a number of side streets, more private, more contained. Grimey and unlike them but...
"You need to be calm. You need to be focused. You need me Cersei. You need us, he told her, finally letting his hands wrap around her waist. "We can wait...until we are alone, until we've talked to Joffery." His lips met hers, just for a second, closely. "...Or..."