He writes that Lady Stark will return to him… with company.

Tyrion tapped the end of his quill against his mouth, before his lips curled into a devious smirk. Lady Stark he had given a reason to need to lay with him, but just how far could he push this lovely book? It was time to test the limits.

He brought his pen to ink, then glided it across the pages as he wrote:

Lady Catelyn Stark will return to Tyrion’s bedchambers tonight, utterly enraptured by him.

Tyrion pulled his pen back, inspecting the words, before another thought wormed it’s way into his mind, and he couldn’t help but wet his quill again before adding more…

Only this time, she shall bring her sister, Lady Lyssa Arryn with her to share the sensation with her.

Tyrion pulled his pen back as though it was escaping a fire, huffing out a heavy breath as he read back the very words he had put to page. Lady Stark he had been able to manipulate easily enough, but it was hardly a secret that her sister despised the little Lannister, and it seemed impossible that even something like this book would compel her to bed.

Time would tell though, as Tyrion waited for the ink to dry before closing the book and heading to his bed for rest.