An old wooden ruler

From this position I can clearly see when he grabs an old twenty inches wooden ruler from one of the drawers.
He holds it by one end with his right hand as he places his left hand near the middle in order to balance the weight.
With the ruler in his hands he walks around the desk towards my back leaving my field of view.

"I'm going to teach you all discipline" He repeats at my back and after a few seconds I feel his hand lifting my skirt.
"Hey what are you doing!?" I say as I lift my body from the desk as a reflex.
I have probably lifted my upper body just a few inches from the desk before Mr Grant pushed me down against it once again.
"Stay There!!" He shouted.
Afraid of getting him angrier I did as he said.

With the back side of my skirt lifted, and my underwear being exposed to the whole class I hear him take a step away from me.

"So Danielle, do you admit talking and interrupting my class not once, or twice, but three times today?" Professor Grant asks me.
"Yes..." I say timidly
"Then do you accept that I must punish you for that behavior?" He asks me.

I think for a moment not knowing what to say.
It is true that I did talk in his class, but I wasn't the only one. Besides he wasn't actually giving the 'class', Samantha was doing the reading...

"ANSWER ME!!" He screams as he hits my buttocks with the wooden ruler.
The wood makes a loud 'whack' sound against my skin followed by my scream.
"Aaaaaaah!!!" I scream with all my lungs.
I can feel the burn in my buttocks where I received the hit.

A few seconds pass.
"Answer me" He calmly repeats
I am still recovering from that first hit when I hear that dreaded sound again.
The ruler its cutting the air towards me.

Whack

"Aaaaaaah!!!" My scream echoes in the silent room.
"Answer me" he says again.
"Yes...." I reply to him trying to stop this.
"Louder!!" He says to me

Whack

"Aaaaaaah...... Yess!!" I tell him
"Good" He merely said as he landed another hit against me.

Whack Whack Whack Whack

After each hit I screamed.
After each scream I felt that burning sensation getting stronger.
Until it suddenly stopped...