"It seems likely." Completely unaffected air you've got there, Loki, but; Look. He may not have put it here but it's here now and here it shall remain. Clint made it happen (whether or not he wants to admit it or likes that truth) and Loki loves Clint, so.

It. Stays. Put.

He remains a frost giant when they're inside, which is more a mark of how comfortable he is with Clint knowing his secrets as they are and having less to do with how cold the library may or may not be still. "Purposefully damaging the books would probably be painful in a way I wouldn't enjoy, but I doubt you'd do that anyway." Plus the library would likely defend itself from such an attack as it stands. "It should be fine. I'll let you know if anything feels... off, I suppose."

Mostly he wants to stand there and watch Clint handle the binding, the pages, moving drawings of things Loki knows, places he's been, people he's met and encountered along the way. This is a book of languages; the faces in it are of those who taught or opened the door for Loki to learn a new dialect, to expand the AllSpeak, to study the written word as it was intended to be understood.

It's a pretty heavy tome.