They're all children in this chappie

Cast:
Nagisa-Princess Jesh
Lucy: Knight in shinning armor
Sting: The Devil
Natsu: The Dragon
Gray: Princess Jesha
Juvia: The Demon with the Devil
Kayano: The Angel
Okuda: Prince Marches
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Practice:

Lucy: I, your prin-

Nagisa: WHY DO I HAVE TO BE THE PRINCESS!!??

Lucy: SHUT UP, AND STOP BEING A WHINY BABY AND SHUT THE HECK UP AND BE THE PRINCESS!!!

Asano: LUCY, WHY WON'T YOU LOWER YOUR VOICE!!

Lucy: NAGISA THE HECKING WHINNY BABY, SO WHY SHOULD I LOWER MY VOICE!!!

Koro-sensei: Okay, okay, children, this play is for fun, Asano-kun, I put you here to be the director not the boss.

Natsu: *Roars fire* I AM THE FIRE DRAGON.

Sting: Why can't Asano be the devil his character suits it better.

Nagisa: I'M BEING KIDNAPPED HERE!! HELP ME YOU USELESS KNIGHT!!!

Lucy: BE HAPPY I'M STILL TRYING TO TAKE YOUR HAND FORCEFULLY!!!

Okuda: I shall help my darling sister and fight the mighty dra-dra-Dragneel?

Natsu: I SHALL DEVOUR THIS BRAVE CROSSDRESSING PRINCESS WHO CLAIMS TO BEAT ME!!! *chases Okuda around*

Okuda: *RUNNING*

Gray: I AM THE MIGHTY PRINCESS JESHA BOW DOWN TO ME!!

Juvia: The Demon must defeat this very unusual princess/stripper to win immortality

*Outside the curtins*
Outside the curtins are:
Karma: Nagisa's Brother
Levy: Lucy's sister
Wendy: Juvia's big sister
Sugino: Okuda's Brother
Lyon: Gray's cousin
Itona: Big Brother of Kayano
Rogue: Sting's big brother
Igneel: Father of Natsu

Karma: I wonder if Nagisa is the knight...

Wendy: I don't think Koro-sensei will let that happen....

Lyon: I hope Gray is not gonna fail this one.

Igneel: My Natsu is greatest of all your children

Sugino: No Okuda is gonna be the best

Itona: I don't like this but Kayano-chan will win

Levy: Um, I don't really know what's happening but Lucy is gonna be the greatest actor of all

Rogue: Sting is gonna be the best!

At the play

Everything was smooth, until Nagisa was getting kidnapped.

Sting: I have Princess Jesh, I shall take this knife and take her heart and eat it gracefully!

Nagisa: Oh my useles knight that was forcing me to marry him, save me from this Devil who claim to eat my heart with blood splatter in the ground.

Lucy: My spoiled-bratted princess, your knight is here to save you!

Okuda: I shall assist you, I shall defeat the fire dragon, who is been killing, burning, and leavimg blood marks on the village!

Natsu: I AM HERE!!! I SHALL DEVOUR THIS CROSSDRESSING PRINCESS WHO CLAIMS TO KILL ME!!

Gray: Oh my, oh my, no one has their attention to me!!! SOMEONE GIVE ME ATTENTION!!

Juvia: The demon will give you some attention only you have to form a contract to me.

Kayano: As your guardian angel I won't let that happen!

Juvia: Wanna have a fight Angel?!

Kayano: You bet I am Demon!!!

As they fought Princess Jesh was saved, Princess Jesha had all the attention she wanted, Prince Marches had took the Dragon's body and offered it to the angel and they had been newly wed, as for the others it didn't go so well for them.

Reactions:

Karma: Well that was unexpected...

Sugino: I never taught Okuda how to fight!

Itona: Those lessons paid off.

Wendy: Juvia-chan was kinda.....great.

Levy: "Spoiled-bratted princess" really?

Rogue: I did not expect this is gonna be gore!

Igneel: Natsu is a dragon....and 'Crossdressing Princess'? Where did he learn such a thing?!

Lyon: So....why is he Princess Jesha?

All of them(Except for Itona): I ENROLLED HIM/HER TO A WRONG SCHOOL!!!