AN: Having read some amazing one word challenges, I have decided to put my own spin on it by using simply quotes. If anyone finds it rather confusing, I'll add text. I also intend to make a second part by using simply text.
Disclaimer: Not mine.
1. Laughter.
"Do you hear that, Peter?"
"Sounds like a ghost."
"Don't be silly. Ghosts don't exist."
"You never know, Lu. You never know."
2. Clever.
"When did you become so smart, Ed?"
"Since you became my brother."
"But I've always been your brother!"
"I know; and I've always been smart."
3. Satisfaction.
"How dare you say such things to my sister!"
"Peter, it's alright."
"Alright! Lucy, he impeached your honour!"
"Yes, and that is why I demand satisfaction."
4. Trust.
"Try it. You'll love it."
"Edmund, if this is another one of your tricks..."
"Would I lie to you, Peter?"
"Yes."
"Hurt. Very hurt. Take a bite and make it up to me."
"Well, alright...."
"What do you think?"
"It's actually... nice..."
"Maybe next time you'll trust me, then."
"... Maybe..."
5. Arrow.
"Edmund... I don't think that that is the traditional way to use an arrow."
"You're not the one with the meat stuck between your teeth, Susan!"
6. Sacrifice.
"I made you a bowl of soup, Peter!"
"It looks... delicious, Lucy."
"Drink it. What do you think?"
"It... tastes wonderful. Thank you."
"I'll make you another one!"
"... Thanks..."
7. Beauty.
"Susan, what makes you so beautiful?"
"I'm not beautiful, Lucy."
"I think you are. Inside and out."
8. Glint.
"Lu-cy, Peter and Susan have been awfully dull lately, don't you think?"
"Yes, they have."
"Do you think they need some livening up?"
"Edmund. You read my mind."
9. Joyful.
"I feel like singing!"
"Sing away, Lucy. No one and nothing can hear you, but me."
"But you are everyone and everything to me, Peter."
10. Lullaby.
"Peter, do you remember the song Mum used to sing?"
"Yes."
"Sing it to me... please?"
"Only for you, Lucy, and you'd better not tell Edmund."
11. Memory.
"Peter, do you remember?"
"Remember what?"
"... Our mother?"
"I can't forget her, Edmund."
12. Forgetfulness.
"Peter, do you remember our mother?"
"Did we ever have a mother, Edmund?"
"I'm not sure."
13. Blood.
"Why, Edmund, must it always be your blood?"
"Because it can't be your blood."
"Stubborn ass."
"I love you, too, Peter."
14. Rainbow.
"Look at the rainbow, Edmund!"
"I see it."
"Every rainbow is a smile after rain, I think. They're so beautiful and pure."
"Lucy?"
"Hmm?"
"Don't ever change."
15. Twirl.
"Lucy, stop spinning! Your dress is knocking the punch bowl."
"I'm just so happy to be alive, Susan!"
"Then twirl as you please."
16. Tipsy.
"Edmund seems awfully cheerful today, doesn't he, Su?
"There's a good explanation for that, Peter."
"Oh, what?"
"The fauns dropped a gallon of wine down the well."
"Oh. No."
17. Protective.
"Peter, Edmund, Lucy, I'm getting married!"
"That's wonderful, Susan!"
"Thanks, Lucy; but where did Peter and Edmund go?"
"They went to kil - I mean - talk to the bridegroom."
18. Lustre.
"Gah, Peter, put a helmet on."
"But why, Ed?"
"That new shampoo Susan gave you is blinding me."
"Well, not everyone can have such shiny hair."
"I'll preserve your manly dignity, Peter, and pretend you didn't say that."
19. Niggle. (1)
"Gah. Hah. Two royal asses riding a bag of bones apiece."
"Ignore the blackbirds, Edmund."
"I'm trying, Peter."
"Blimey, you'd think the wind had changed, their faces are so squished. Ugly babies, they must have been."
"Do you know what I feel like right now, Peter?"
"No, what?"
"Blackbird pie."
"You wouldn't eat a talking bird, Edmund!"
"No --"
"Hah, I'd say they were brought up in a barn and crowned for a lark... but that would be an insult to the larks."
"--- but I've never felt more tempted, Peter."
20. Clean.
"Edmund, I've spent half the day hanging these drapes, and you have to splash paint on them!"
"I'm sorry, Susan, but look on the bright side --"
"And what bright side would that be?"
"You have the whole other half of the day to clean it."
"Run, Edmund."
(1) Based upon my own fiction that blackbirds in Narnia are extremely disrespectful.