Over her knee

"Wait right there," Nathalie says and steps into the hall. Adam hears her knocking on Cassie's door.

Oh God... What is she doing! Adam looks around for somewhere to hide, but sees nothing. If Cassie finds him wearing a girl's school uniform he'll never hear the end of it!

The music grows louder and less muffled as the door opens.

"Hey Nathalie," he hears his sister say.

"Hey Cassie. Do you have a hairbrush I could borrow for a bit?"

"Sure." A slight pause. "There you go. Bring it back when you're done, I need it before we go out."

"Sure thing."

The music goes muffled again, and Nathalie slips back into Adam's bedroom, now wielding his sister's pink hairbrush.

"You're not serious," Adam says weakly.

Nathalie grins knowingly, then sits down on his bed and primly smoothes her short black dress over her knees. "Come on," she says, patting her smooth thigh.

Slowly, feeling ridiculous, Adam lowers himself onto her lap, his erection pressing against her crotch. Nathalie wraps her legs around his own in a lock, holding him effectively and firmly in place. He hadn't expected her to be so adept!

She lifts up the school dress and giggles.

"Oh, my! You look so cute in my panties."

She tugs the exposed elastic waistband and lets it snap back against Adam's skin. He shifts position uncomfortably, but her leg lock holds him firmly in place. At least she can't see me blush, he thinks.

"You're going to get spanked in the way that any naughty girl at my old school would be. You will count every smack and thank me for it. Do we understand each other?"

He nods. How humiliating.

Smack! She bring's the blunt end of Cassie's hairbrush down with a vicious swing.

"Say it!"

"One. Thank you Nathalie."

"Miss Chapman," she says.

Smack!

"Two. Thank you Miss Chapman."

She rubs his ass vigorously. "I've been reading up on spankings for the last few days," she says. "The internet is a wonderful thing. I'm currently rubbing your ass to open up the blood capillaries. It will make you more sensitive to a good spank."

Smack!

"Ow! For fuck's sake. Three. Thank you Miss Chapman."

"I can't believe you still have that erection! Let's see what we can do about that."

Adam has counted to twenty and can feel the tears in his eyes before Nathalie finally peels the panties down to his knees.

"The last twenty are on the bare," she says smugly. "Be a good little girl now and don't complain."

Smack!

"Twenty one! Ow ow ow. Thank you Miss Chapman," Adam says through gritted teeth.

Then there comes a knock on the door and Cassie's voice.

"Nathalie? I need my hair brush back."

Adam tries to bolt, but Nathalie tightens her leg grip and holds him in place. "Don't move! We're not done," she hisses.

Then, more loudly,"I just need it a little longer, Cassie," she says.

"Come on Nathalie. I need it now."

The door handle turns and the door starts to swing open.