Indeed! She burns to be of use to the Royal Person!

"Certainly, Your Grace," said Catelyn, leaning forward to rub Cersei's flawless skin. The Queen gave a happy little groan as Catelyn's fingers massaged her back, working up a proper lather. Cat grabbed little handfuls of water and poured it over the Queen's skin, letting the suds run back in the tub.

"Mmmm, very nice," whispered Cersei. And then, to Catelyn's surprise, she rose in the tub, the water rolling off her damp, glistening skin. "Perhaps, you would go lower...?"

Catelyn nodded and ran her hands down the small of the Queen's back, rubbing and pinching the nubile flesh. And then one of Cersei's hands covered hers, and pulled it down to one luscious ass cheek. "Lower," hissed the Queen urgently, pressing Cat's hand into her skin. Cat obeyed eagerly, pressing her fingers into it and watching Cersei's ass ripple as she played with it.

The Queen turned suddenly, smiling in a manner that was downright predatory. "Perhaps you could take care of my front now?"