He wants a king

"As a king you will swear to grant whatever desire I ask..." The stern face broke into a laugh. A mocking cruel laugh. All you can do is stand there as he laughs in your face, feeling your cheeks reddening as you do. He smiles darkly as he finally stops laughing. "A king. Yes, you know what King Rishard, you can in fact do something for me. As a king. All you royal's like to pretend you are brother-king's don't you? So you can pay the debt of a fellow king."

"What debt?" You ask, assuming his son-in-law has slighted him in some way.

"The debt of humiliation that King Aerys the second of his name, of the House Targaryen. You will pay the debt he owes me and cannot pay from whatever frozen hell he has been cast into." He smiles cruelly.

"How? How can I pay a dead man's debts...?" Confusion overtaking embarrassment.

"Strip." Tywin says softly.

"Excuse me?!" You blurt out despite yourself.

"You heard me your highness... strip. Take of your clothes. All of them. Now. I want to see a naked king before me, humbled and stripped naked." Tywin settling back into his chair. "That is if you want my help. You do don't you?"