He barely kept a smile of his own inside at seeing the genuine slant to Orion's smile, though his optics deepened slightly with his pleasure. Megatron looked through the stack again and picked out the overview volume plus the first few primary reference volumes for the first era, stacking them in their own little stack off to the side of the still-big larger one.

"Here, I believe. I would assume the overview would be useful to get a brief, overarching idea and then start from the beginning?" He had already decided, yes, but he made it a question to see if Orion, who was turning out to be quite pleasant to talk with and obviously knowledgeable about the subject, would agree. Or even decisively give him another tack to use (in a way he almost hoped for it).

What he wanted, Megatron found, was to put the librarian in a setting where he wasn't working, and talk about these things some more.

See if he'd say other things, explore if that genuine smile could be lured out some more... and maybe other things.