Moondancer (G1): What about this? It sounds promising.
Moondancer (G4): Oh yeah, that's a good one. It's brand new, it came out just last year.
Moondancer (G1): I'll take it too.
Moondancer (G4): It's also Stephen's final book. He died a while ago.
Moondancer (G1): Aw, that's sad.
Twilight Sparkle: Oh, hi Moondancer! I didn't think you'd be here at this hour.
Moondancer (G4): Uh oh, of all the possible ponies in Equestria, why did it have to be her?! Uh, hi!
Moondancer (G1): Uh...
Twilight Sparkle: I didn't know you were interested in boopology!
Moondancer (G4): Um... yeah. I... I started studying it a while ago with... wh... with my friend here.
Twilight Sparkle: Hi there! I don't think we've met yet. I'm Twilight Sparkle, the princess of friendship and Moondancer's friend!
Moondancer (G1): Umm, hi! I-it's nice to meet you. A-a real princess! I'm... I'm Moon... Hoofer. Moon Hoofer.
Twilight Sparkle: It's a pleasure meeting you, Moon Hoofer. Say, that's an interesting selection of books you have there. You know boopology is a restricted subject?
Moondancer (G1): Ummm...
Moondancer (G4): Yeah, umm, we know.
Twilight Sparkle: And checking out those books requires a special permission?
Moondancer (G4): *gulp*
Twilight Sparkle: Is everything okay? Listen, I really hate to do this, but as a princess it is my duty also to enforce the law. We are also in the restricted wing of the library.
Moondancer (G1): ...
Moondancer (G4): ...
Twilight Sparkle: You do have a permission for these books, right?
Moondancer (G1): ...
Moondancer (G4): Um... *visibly sweating*
Twilight Sparkle: And you have a permission to be in the restricted wing too?

Extra! Extra! Read all about it! The Princess of Friendship exposed interdimensional spy ring trying to smuggle restricted information to alternate universes! Read all about it here! Only two bits!

"Obviously this is a very unfortunate case. I've known Moondancer personally for years and I never could have suspected her of a crime like this. The media is calling it a spy ring, but personally wouldn't use such a harsh word to describe it. This smuggling ring, as I prefer to call it, has apparently been operating for years, right under our noses. Just because she was working with her own alternate reality self does not make this crime any less serious" the princess explained in our interview. She continued "I really hate seeing her imprisoned over this, but crimes like this simply cannot go unpunished. While I won't completely repeal her sentence, I will use my powers to reduce its length as much as possible. I will also work with Starlight Glimmer to personally ensure that Moondancer will be rehabilitated as best as possible, and she will be a good member of the Equestrian society again one day. That is my duty as the princess of friendship. However, our Moondancer is not the problem. The real problem is two-fold. First, are there other smuggling rings like this in operation? During the interrogations, both Moondancers claimed they had no knowledge of other ponies who could be involved in operations like this. Second, the interdimensional scandal this incident has created is going to be very messy to deal with." the Princess then went on a twenty-minute monologue about various interdimensional problems which we've chosen not to reproduce here.

It's a silly idea, I know. Those background bookshelves were traced from Amending Fences and it took ages to do. Way, way too long, to be honest.