TVR/Janet2/Bath/Bed/Incest/Changes/Incest/Friday/Daddy/Saturday/Susan

The following Saturday morning Susan arrives with her overnight things in a back-pack as if she was going hiking.

“Hi Susan.” Andrew says, looking her up and down, paying particular attention to the twin mounds of her developing breasts pushing it out.

She grins. “I hear you and Janet have been playing some interesting games.”

Andrew blushes and look round quickly to see if anyone else can hear. Then he takes her bag and follows her upstairs to Janet's room. You see him peeking up her skirt as she climbs the stairs but when he tries to follow you into your room you tell him to go away. Susan has something she wants to show you.

She takes a small package out of her bag and unwraps a cream coloured plastic tube about eight inches long with a blunt point at one end and a screw cap on the other. She twists the cap and it starts buzzing. "What is it," you ask.

Susan giggles. "Can't you guess?" By way of a clue, she hikes her skirt up and points it at her pussy. "It's called a vibrator... Cos it vibrates I guess. You put it in your pussy when there isn't a cock handy."

She pulls her knickers to one side and slides it straight in until almost all of it is out of sight inside her. "If it wasn't so noisy, I'd take it to school and use it in class," she says. Then she pulls it out and slides it up her slit so that it is against her clit. It feels real nice when you press it on your clit," she says and as she does so. you can see how it's affecting her. She holds it out to you, "Do you want a go," she says.

Watching Susan has made you wet, so it slides in easily, although not as far as it went into her. Feeling it vibrating and buzzing inside you is weird but sexy too and you are just beginning to enjoy it when Mrs Johnson calls you all down for lunch and you all go down to the kitchen. Susan nudges you when she sees Andrew looking at Mrs Johnson's big tits and you both giggle. After lunch she will go home, which means that you have the house to themselves for at least three hours.

Andrew looks disappointed when you shut yourselves back in your bedroom, but when you try the new toy, it doesn't work. You fiddle about with it and Susan says that the batteries are new, so you decide to see if Andrew can fix it. When you knock on his door he is working on a model aeroplane and sounds annoyed at being interrupted.

“We need your help with something,” Janet says.

“What,” he says.

“Come and see," you say.

He puts his model down and follows you into the bedroom.

“It doesn’t work,” Susan says, holding out the vibrator. She shows him how the end comes off and the batteries on the table.

“What is it,” he asks.

“You’ll see” Susan replies, with a giggle. "See if you can get it to work." She hands it over.

“What’s it supposed to do?"

“It just buzzes," she says and we both burst out into fits of giggles.

He sits down and examines it. Checks the batteries and then peers at the inside of the cap. He borrows a nail file, pokes at it and then put the cap back on. Of course, it promptly starts buzzing and vibrating in his hand, he drops it on the floor with surprise and we can't help laughing at the look on his face.

“Well it's working," he says looking grumpy at being laughed at, “but I still don't see what it's for."

Still giggling, Susan picks it up. “Shall we show him, Janet?"

“Sit there and don’t move” Susan orders, then she turns to you. "Pull your skirt up and sit on the edge of the bed," she says. You do as you're told. "Spread your legs apart," Susan orders and when you do, he has a perfect view of your pussy.

Susan takes the vibe and puts it between your legs, and it dawns on him what it was designed for. “Where did you get it,” he asks.

You are biting your lip as Susan strokes the buzzing toy up and down your slit. “Uncle Jim gave it to me,” Susan says. “Look at your sister,” Susan says. Your whole body is blushing bright red, and your hips are bucking up and down as she presses the vibe against your clit. “I love to watch her orgasm, and she cums so easily.”

When you've calmed down, you flop back on the bed. “Do you want to do me," Susan says with a grin, looking at Andrew. His stiff cock is pushing out the front of his shorts. "Budge over a bit," Susan says and you wriggle over near the wall. Susan gets right up on the bed beside you and pulls her skirt up.

He picks up the toy and twists the end to start it buzzing again. He holds it against Susan’s chubby pussy and slides it up and down. “Suck it to make it wet” Susan orders.

He does as he's told, and then slip the wet tip of the tow into the entrance of her vagina. She lets her legs flop wide apart allowing him easy access and he gently pushes it further and further in until half of it is buried inside.

“Am I doing it right,” he asks

“Yes!” Susan’s voice sounds strained. “Press it a little harder against the top where my clit is.” He adjusts the angle, and seconds later, she clamps her knees together and it's not long before she is climaxing.

• An anatomy lesson