Here is how Telling Yuna a story goes in A Sick Day for Yuna.
Tigatron: You're going to be alright, Yuna, You rest up and I'm sure your Aunt will do what she to make you feel better.
Princess Yuna: Yes, Tigatron. (coughs)
Prince Isamu: (about to get close to Yuna)
Princess Luna: (grabs Isamu) No, No, Isamu, Your big sister is sick.
Hiro: We don't want you getting sick too.
Princess Celestia: Here, Yuna, Catrina fixed you some Hot Lemonade to clear your throat.
Princess Yuna: Thanks, Aunt Celestia. (coughs and drinks)
Discord: (dressed as a nurse) No wonder you're sick, You've been outside for too long without a sweater.
Princess Luna: Shall I get you some more?
Princess Yuna: Yes, Mama.
Discord: Will it make feel any better if I tell you a story, Yuna?
Princess Yuna: That would be wonderful.
Discord: Very well then, Have I ever told you about how Fluttershy reformed me and I became friends with Twilight and the others?
Princess Yuna: Tell me more.
Discord: Alright then.
Flashback shows Discord's past of being reformed by Fluttershy.
Discord: Hahah! You see? She wants to have fun with me because we're friends. She can't use the elements against me because we're friends. I'm free forever! (laughs)
Fluttershy: (growls) Not. Your. Friend!
Discord: Who cares? I can do whatever I want, whenever I want. I'm Discord, the master of chaos! You think you can boss Discord around? You think I'm just going to turn all this back because you say so? Because if I don't, I'll lose the one friend I ever had? (pause) Oh. Oh. Well played, Fluttershy. Well played.
Main cast sans Fluttershy: (cheering)
Discord: I liked it better my way, but... I guess when you're friends, you can't always have things exactly your way all the time, eh?
Discord: Yes, Princess, I'm ready to use my magic for good instead of evil. (under his breath) Most of the time.
Another flashback shows Twilight claimed her own kingdom with her friends.
Princess Celestia: You've been wondering what you are meant to do as a princess. Do you know now?
Twilight Sparkle: As princess, I believe I have the power to spread the magic of friendship across Equestria. That is the role I am meant to have in our world! The role I choose to have! But I didn't defeat Tirek on my own – it took all of us to unlock the chest!
Princess Celestia: Then it is unlikely you are meant to take on this task alone.
Main cast: (gasping in awe)
Pinkie Pie: Wowee!
Princess Celestia: You are now Twilight Sparkle, the princess of friendship. But what is the princess of friendship without her friends?
Discord: Wait a minute, where's my throne?!
Fluttershy: I don't think you're quite there yet.
Discord: (chuckles) Yes, well, I suppose not.
The flashback ends.
Discord: And that's how I've learned that Friendship is Magic.
Princess Yuna: Great story, Discord. (coughs)
Princess Luna: I'm back.
Prince Isamu: (fusses for the hot lemonade)
Princess Luna: No, Isamu, It's for Yuna. (gives the hot lemonade to Yuna)
Tigatron: (to himself) There must be some way to cure Yuna's Pneumonia quicker.