"...four, almost there, feeling more and more alert now..."
"Five, fully awake, feeling refreshed and fully aware as you emerge out of trance."
>Celestia yawns and stretches her arms wide
>"Hhhhh... Master, did you hypnotize me again?"
"I sure did. How are you feeling, Celestia?"
>"Goooood..."
>She shudders in pleasure
>"Why did you stop? Put me back under."
"It's morning, Celestia. I had to wake you for day court."
>She whines. "No, I don't wanna. Put me back under."
>After weeks of training and mindless obedience, her mannerisms have evidently regressed
"You have to, Celestia. The ponies need their princess."
>She flops to the ground. "But I need youuuuu~"
*sigh*
"Alright, Celestia, look into my eyes. *Focused sun*."
>Her eyes lightly glaze over. "I listen and obey."
"Very good. Celestia, you love being like this, don't you?"
>"Yes, Masterrrr."
"But what do you think would happen if the ponies saw you like this?"
>"N-nnngh..."
"They wouldn't like it very much, would they?"
>"N-no, Master..."
"That's right. We can... convince them to accept this, but it will take time. For now, I need you to be patient."
>"Patience..."
"That's right. Our little secret."
>"Secret..."
"Can you do that for me, Celestia? One more normal day court, just like yesterday."
>"B-but-"
"Shhh. What do good girls do?"
>The words escape like clockwork. "Good girls obey their Masters."
"Good girl. Now, are you ready for day court?"
>"Yes, Master..."
"Very good girl. Out of trance now." *snap*
>She only has a moment to adjust before you give another trigger
"*Solar strings*."
>Immediately, her body freezes limply in place, ready for commands
"Chin up, confident. Good. Smile. Good. Legs straight. Good. Feel your voice becoming wiser, more mature again. Good."
>You pick up the crown on her bed and place it over her head
"Remember what it means to be a princess, Celestia. Let your memories of a thousand years wash over you again. Ready? Nod."
>She nods.
"Release." The command to end all current triggers.
>Her body is hers again. She stretches some more, then brings a hoof near her face, observing
>"You know, it feels odd. Half my mind wants to go back to ten minutes ago and the other half feels right at home now. I can't tell which half feels more familiar."
>It looks like she's back to normal. Nice.
"It almost feels odd seeing you like this when I know you're still com-plete-ly o-be-dient."
>You give her a sly grin
>She grins back. "Don't I get a reward for being such a... good girl?"
"How about this? Every time you feel the need to regress, and you resist the urge, feel a tingle of pleasure shoot through you. Just enough to feel good but not enough for anypony else to notice. And yes, that's a command."
>"How mischievous. It will be done..." she winks. "Master."
>And she's off and out the door, with the rest of the palace none the wiser