You were her student, and went to her office by a something, but then you get sudden knock out. Then you slowly woke up, see that you sitting down on comfy bed, without your clothes, you was bit little confused, as you see your ankles stocked in medium pillar, held your exposed feet in place, as you try to move arms, you notice you sit on princess celestia's lap, as she has a small warm smirk, looks down at you, you had behind her, and your wrists are tied behind around her neck.

She spoke, in warm, teasingly tone.

Hello, didn't know that would come~?

She chuckles, as her hands stroke your belly, and her wings gently, lightly tickle your armpits.

This is just a test, so... Don't worry, i'll take a care of you, my dear student~ i got also a small gift~

She use her horn on forehead, to use magic to bring a three feathers in air, but not just a normal feathers, a phoenix feathers.

You gonna love this~

The feathers then gently tickles your feet, as her hands tickles your belly, and her wings softly tickles your armpits.

Tickle, tickle, tickle~