He controls his desires

No, no, no, this isn't right!
With all the willpower he could muster, Robb **** himself to kiss her forehead again instead of her mouth, then pulled her into a tight hug. "It's fine, Sansa", he whispered, and she nestled her head on his shoulders. Robb tried his best to just enjoy the warmth and closeness and ignore the images in his head of Sansa and him, naked and entwined on a bed, kissing and having sex. Some things should stay fantasies, nothing more. I'll still have Cersei, the Targaryen girl and Margaery, that's more than any man could hope for.
After a while, he detached himself from his sister and kissed her cheek again. "Are you joining me for dinner?"
She smiled happily. "Yes."

They had a happy dinner together, just talking and laughing like in the old times. It was great to see Sansa like that. She had changed, no doubt, there was something deep in her eyes that showed she was not that naive girl anymore - but when she laughed, Robb forgot that and was just glad he had his sister back. Things would not go back to normal with their father dead, but Sansa could find happiness, and he would do anything to help her, Robb promised himself.

Filled up with lemon cakes, they left for their rooms, sharing another loving hug. Robb Stark sat down and wrote a few words to his mother at Winterfell that Sansa was safe. Just as he finished, there was a knock at the door. "Come in."
It was, once again, the Forrester girl, this time accompanied by another girl about her age, lighter brown hair and softer, more southron, somewhat sensual features.
"Lord Stark, we are to make sure you have anything you wish for. Is there anything you need?"
Robb took a good look at them. The new girl seemed less shy and smiled at him with fluttering eyelashes, clearly interested in him. "What's your name?", he asked her.
She made a step forward. "I'm Sera Durwell, milord, at your service. I was a handmaiden to Lady Margaery, and I am unbound and available for marriage."
Mira Forrester suppressed a slight gasp, and Robb smiled. Did she seriously hope for him to marry her? She was a pretty thing, no doubt, but the Lord of Winterfell would only ever marry a daughter of one of his bannermen or a maiden from another Great House. He quickly considered putting those two girls to good use before going to bed...