"Only 'probably'?" Only probably read it? "All the time and effort I put into acquiring that book," he bemoans, clearly acting up, clearly out of reaction to Istredd being Soft and Lucifer not knowing how to handle that, ever. Time and time again, still doesn't have any proper response to it. "My few pennies, spent away. All for a token." 'Of his affection' is certainly left out of the sentence maybe because he only quite realized what it was.

That's fine.

It's nothing.

Don't worry about it.

Sweep it under the rug with all the skeletons.

Uhhhhhggggnnnh.

Look. No reaction is better than the 'good for you' reaction that almost manifested in his thoughts.