Bev gives Katie a ride home

After a few moments consideration, during which Katie was terrified that someone was going to come along at any moment, Bev smiled, and pushed open the passenger side door.

Katie hurried around the car, but Bev accelerated a few feet away from her just before she could climb inside.

"Bev, stop it!" Katie complained, after two more fakeouts.

Bev finally allowed her step-sister to fold herself onto the passenger seat and slam the door closed, but as she pulled away, she decided to inflict further humiliation on her.

"So, Katie?" Bev smiled sweetly. "How did you end up running naked around school?"

"I...I'd rather not say..." Katie mumbled, sliding low in her seat and covering her torso with her arms.

Bev touched the brakes and pulled up at the side of the road.

"Or you can get out and walk?" Bev offered.

"No!" Katie couldn't stomach another streak! "Fine, I-I'll tell you..."

With her face becoming progressively more red, Katie retold the events of the previous day.

"...and that's when I came out of school in a robe."

"You've had quite a day, haven't you?" Bev chuckled. "Oh, and it was me who stopped Luke getting any clothes to you. Now, start masturbating."

Katie's head was a mess. It had been traumatic having to relive some of her most humiliating moments, not helped by finding out that her own sister had deliberately prolonged her nudity. And before she could get over that bombshell, she was being told to perform an incredibly private act!

"Bev, I can't-"

"Oh, come on, Katie. I know you've never even got to first base with a boy, but surely you pleasure yourself in your spare time?"

"That's not...I CAN...I just-"

"Well, there you go, then!" Bev grinned. "Get to it!"

Katie wanted to explain that while of course she DID masturbate, it wasn't exactly appropriate to do so in a moving car. But she also didn't want to get into a conversation about that, especially when Bev could use it as leverage against her.

Manoeuvring herself into a more comfortable position, Katie closed her eyes, spread her legs, and pushed two fingers between her lower lips...

xxx

Bev couldn't believe what was happening! If she knew Katie was this easy to manipulate when naked, she would have stolen her clothes a lot earlier! Not only had she been so scared to ask anyone for help that she'd ended up spending the entire day naked and practically starving herself, she was now pleasuring herself after very little convincing! She also hadn't denied that she'd never kissed anyone, something Bev made a mental note to keep an eye on; Katie would surely only become easier to bully the older she became without any sexual experience.

The girl in question was breathing rapidly as she worked away on herself, perspiration clinging to her skin. Her breath hitched; she was only moments away from a climax...

xxx

Katie moaned softly as she plunged her fingers deeper inside herself.

She kept telling herself that nothing she had experienced that day was enjoyable, but the brunette had felt a buzz when Luke had nearly seen her naked. She fixed an image of him in her mind's eye, and imagined what it would be like to kiss him, to have those strong hands rip off her shirt and fondle her boobs. He would pull down her pants, slip his hands into her underwear...

She was so close...just a few more seconds...

Someone grabbed her wrist and yanked her hand away.

"We're home!"

Katie looked around, furious, as Bev parked up and switched off the engine.

"What the fuck?!"

"Language, Katie," Bev teased her, patronisingly, stepping out of the car, and giving her sister **** but to hurry after her.

The nude girl was flustered as she padded up the garden path, her bare skin tingling in the cool evening air. She knew that she should cover herself with her arms, but didn't want to risk pushing her body over the edge by touching her sensitive areas.

"Bev, wait-!" Katie started to say. She needed time to calm down; she would die of embarrassment if Victor or Gail saw like this! But another night outside was off the table, so Katie followed her sister into the house.