She leans forward and peers over her spectacles, with a stern face and a no nonsense approach. Her blonde hair is tucked behind her ear. She is sitting cross-legged on her desk in front of the whiteboard in school.

“Today, I’m going to show you two pairs of plastic panties. I want you to compare and contrast the two.”

She leans back and uncrosses her legs very, very slowly. I feel myself stir down below. Her panties sounds like thunder and she’s trying to limit the noise with calculated movements.

“These are the punishment knickers if you don’t get it right,” she grins. “Everyone will hear you coming a mile away.”

My blonde tutor wriggles to hitch up her tight black mini-skirt. Her panties crackle as she parts her legs. I can see her heat collecting inside her kinky knickers. She unbuttons her white blouse as I stand before her.

“Now, get to know them,” she growls.

My palms feel sweaty as I observe her neat mound inside the clear pink plastic. There’s little pink love heart prints dotted on her stiff kink.

I shake as I smooth her thunderous knickers. They feel so shiny and crisp. I make a fold in her plastic panties and tease it between my fingers.

She’s unclasped her bra and let her hair down. Her legs are parted in the rudest position. I rub her stiff knickers, kneading the knickers elastics. I’m amazed at how thin and crisp her panties are. I cannot believe how loud they rustle.

I make them creak and crackle faster between her legs as she falls back and jerks. I want to pull my aching cock out. I want to dollop my creamy lust in her folds.

“Not so fast, Cowboy,” she teases. “I’ll be right back.

She disappears into a cupboard as I knead my wet head inside my trousers. My head feels so hot and dizzy.

When she kneels doggy-style, on her desk again, her knickers are very different. They’re thick and quieter – more rubbery. Her full kink are powder blue.

“Now pop my noisy hearts on,” she barks. I colour, doing as I’m told. Every movement sounds like a hundred decibels. I’m really aware of the thin, crisp plastic.

I move forward to thumb her fat knickers elastics. Her knickers, I wear, are so noisy. The stiff, crackling smoothness caresses my thick cock.

I thumb her fat, rubbery knickers elastics as she leans forward onto her elbows. Her knuckles whiten as she grips the edge of her desktop. Her high-heels click on the polished surface. Her face is tight and deep red.

I work the rubbery thick plastic over her arse and wet pussy. Her love lips are full and plump through her kinky gusset. I rub slowly. I press her naughty panties against her pussy, making slow and deliberate circles. The plastic rubs and creases as her sex parts in anticipation.

“That’s right,” she growls through her clenched teeth.

I rub her smooth knickers over her wet clit. Her knickers, I’m wearing, stroke my raging cock. I feel hot.

Then I lose control. I snatch her kinky knickers leg aside and bury my face into her parted, plump lips. My tongue seeks her clit as my chin drips. I lick and rub my fat cock as she moans.

“Now, take me, you naughty boy. Fuck me in my naughty, kinky knickers.”

I whip my straining hot rage out and fumble until I find home. My knickers echo around the room as they crack and I pump. Her thick panties are stretched aside to reveal her small, tight bum-hole. I pump like fuck as she sops. My cock glides in and out of her wet tightness as plastic glides across our bums. I pump and clench. I feel my arse twitch. It tightens. I shoot my salty load inside her. Spunk puddles in her plastic knickers.

She contracts and squirts. Her juice hits plastic like angry rain. I fall back and she washes up – taking my hot dick deep inside her throat.

“Mmm!,” she licks. “Mmm. I can certainly taste your salt. You mingle with the smell of hot panties.”

My face must be a picture; the cat who took the cream.

Then I remember her bargain. I start to feel dread.

She playfully points between the two pairs of knickers. She chooses the quieter ones and we swop her fetish.

“There’s plenty of time to make yourself heard,” she crackles in her stiff knickers.