Luna remained quiet for the entire meal, which even surprised her big sister, Celestia. While she does know that Luna can be overly reserved, she was not expecting her to be this quiet. Celestia wanted the next three weeks to be enjoyable for everyone, not just you and your friends. After dinner, you made your way to Luna's bathroom to brush your teeth and get changed into your pajamas. By then, Auntie Celeste had already brought some clothes for you into the room. You make sure to take your clothes into the bathroom with you so you can change in there and not in the bedroom, where there's a chance that Luna (Celestia forbid) might walk in on you.
After you get changed and toss your clothes in the hamper, you walk back outside just as Luna walked in the room.
"Oh. Hi, Luna," you say.
"Good evening, [your name]," she says.
"You were pretty quiet earlier at dinner," you say.
"Oh, I just... wasn't in the mood to converse..." she says, looking away from you. After a brief pause, she speaks up again. "C-can I... ask a favor of you?"
"Sure. What is it?" you ask.
"Well... when you got here, I noticed that you were carrying a sketchbook," she says. "Are you... an artist."
"Pretty much," you say.
"Well, have you ever drawn somepony that modeled for you?" she asks.
"I did for Rarity once," you say, "but that was over a year ago."
"Well, could you... perhaps... draw a picture of me... and I could model for you?" she finally asks.
You can't believe your ears. Luna was offering to model for you. Maybe this was her own (albeit weird) way of trying to open up to you. Whether it was or not, the artist in you doesn't want to pass up the chance to draw one of the royal sisters!
"Sure. Why not?" you say.
Luna's face brightens up, but it was only for a split second, after that, her face was the same as it was before. "Thank you," she says. "It's an honor."
You give an embarrassed chuckle. She didn't have to be so formal. "Oh, it's no trouble," you say. "So, do you want me to draw you in the clothes you're wearing now, or do you want to change?"
What does Luna decide to do?