This is how Princess Luna returns goes in Luna Eclipse.
[We see Ryan dressed as Clover the Clever]
Ryan F-Freeman: How do I look, Twilight?
Twilight Sparkle: Great. So. You think this OpThomas Prime will help you in another world?
Crash Bandicoot: I think the mayor did tell the little ponies to follow Zecora so we can hear the story of... [scary voice] NIGHTMARE MOON! [laughs evilly]
Spike: Scary voice on that one, Crash. I admire that.
Zecora: Follow me, and very soon, you'll hear the tale of Nightmare Moon.
[They follow her to a statue of Nightmare Moon]
Zecora: Listen close, my little dears, I'll tell you where you got your fears of Nightmare night, so dark and scary. [blows] Of Nightmare Moon, who makes you wary.
Matau T. Monkey: Wow.
Zecora: Every year, we put on a disguise, to save ourselves from her searching eyes.
Zecora: But, Nightmare Moon wants just one thing. To gobble up ponies in one quick swing!
[Pipsqueak and Coco screams]
Zecora: Hungrily, she soars the sky. If she sees no pony, she passes by. So, if she comes and all is clear. Equestria is safe another year!
[Ryan sighs in relief ]
Pipsquek: Um. Miss Zecora. If we wear costumes to hide from Nightmare Moon so she won't gobble us up, how come we still need to give us some of our candy?
Zecora: A perfect question, my little friend. For Nightmare Moon you must not offend. [blows some dust]
Crash Bandicoot: Fill up her tummy with a treat or two...
Zecora: So she won't return to come eat you!
[Pinkie and Matau scream]
Matau T. Monkey: Everyone! Dump your sweets at the statue and get out of here!
Pinkie Pie: What he said!
[Thunder claps and a car riot pulls by to pegasi arrive. A hooded character takes the hood off to reveal...]
Ryan F-Freeman: Wow.
Twilight Sparkle: Princess Luna.
[Matau and some friends kneel]
Princess Luna: [Canterlot voice] CITIZENS OF PONYVILE!! We have graced your tiny village with our presence, so you will behold the real Princess of the Night! A creature of nightmares no longer, but instead a pony who desires your love and adoration! Together, we shall change this dreadful celebration into a bright and glorious feast!
[Thunder and lighting happens]
Matau T. Monkey: Whoa!
Pinkie Pie: You hear that, everypony? Nightmare Moon says she's gonna feast us all!
Matau T. Monkey: Run for your lives!
Coco Bandicoot: Pipsqueak, run!
[They flee from Luna]
Princess Luna: [normal voice] Wait! You no longer have reason to fear us! Screams of delight is what your Princess desires, not screams of terror!
[Ryan and Twilight look at each other]
Ryan F-Freeman: I think they think she is Nightmare Moon, Twilight.
[Ryan looks at Luna who is at Ponyvile]
Princess Luna: Madam Mayor. Thy Princess of the night have arrive.
[Mayor Mare gasps and so does the other ponies]
[After Luna leaves, Ryan gets an idea]
Ryan F-Freeman: Twilight and I need to talk to her.
Spike: You can't talk to her, Ryan! She's Nightmare. Moon!
Ryan F-Freeman: She is not, Spike. The Elements of Harmony changed her for good. But, she is having problems adjusting after being banished for lots of years.
[Ryan and Twilight go to talk to Luna]
Ryan F-Freeman: Hello, your highness. My friend and I are...
Princess Luna: Star Swirl the Beared and Clover the Clever. Commendable costimes! Thou even got the hood up and your friend have the bells right.
Twilight Sparkle: Thank you.
Ryan F-Freeman: Let me say our names. We are....
Princess Luna: Ryan F-Freeman and Twilight Sparkle. [Canterlot voice] IT WAS THOU WHO UNLEASHED THE POWERS OF HARMONY UPON US AND TOOK AWAY OUR DARK POWERS!!
[Ryan's ears ring]
Twilight Sparkle: And that was a good thing, right?
Princess Luna: But, of course. We could not be happier. Is that not clear?
Ryan F-Freeman: It sounds like you are yelling at us.
Princess Luna: But this is the traditional royal Canterlot voice. It is tradition to speak using the royal "we". And to use [Canterlot voice] this much volume when addressing our subjects.
[Leaves and twigs fly off the ground]
[Ryan puts his hood up and Twilight adjusts her hat]
Ryan F-Freeman: So, that is why you get some.... Uh.., mixed results. If Twilight and I help you change your approach a bit. You feel better with a warmer reception.
Princess Luna: [Canterlot voice] Change our approach?
Twilight Sparkle: Lower the volume?
Ryan F-Freeman: Will we help you?
Princess Luna: Oh. Thou does have a point, blue unicorn. But, we are not sure if we can.
Ryan F-Freeman: Thanks. My mentor, your sister will be happy like Primus.
[They set off to Fluttershy's house. Ryan knocks on the door]
Fluttershy: Go away, Nightmare Moon!
[Ryan gets confused]
Twilight Sparkle: Did Fluttershy confused you for somepony else, Ryan.
Ryan F-Freeman: No, Twilight. [knocks on the door] Fluttershy. It's me, Ryan. Twilight's friend.
[The door opens]
Fluttershy: Oh. Hi, Ryan. Sorry. I thought you were some pony else.
Ryan F-Freeman: It's ok. Have you met Princess Luna?
Princess Luna: [canterlot voice] Charmed.
Fluttershy: EEK! [goes inside her house]