"Paul, I need to learn more about sex."
The bland statement from his step-sister took Paul by surprise. Just what did she mean by that statement? He shrugged. "Elucidate," he said. He sighed at the startled look on her face. "It means explain further," he said.
"Oh, then why didn't you just say so?" said Dianne. "Anyhow, I'm eighteen. I'll soon be wanting to have sex with boys, but before I do I want to know more about how it's done."
"Well don't look at me. You may only be a step-sister but I'm pretty sure it's against the law and your mother would kill me if she found out," said Paul.
"Oh, yuck. Don't even think that," laughed Dianne. "I've been to the sex ed. classes and I know the theory and I've even seen some porn, but none of that's real. I want to watch while someone had sex so I can see how it's actually done in real life. I know you have sex with your girlfriends and I thought you could arrange for me to watch some time."
"That's called being a voyeur," said Paul with a grin. "I could probably arrange it but I'm between girlfriends right now. It's not considered quite the thing to do to call up an ex and ask her to come over for a quick fuck."
"Then how about I ask one of the girls I know to come over. I'll pick one who's over eighteen and probably not a virgin, and you can screw her."
"What on earth makes you think that a girl you invite over her is going to agree to have sex with me?" asked Paul curiously.
"I wasn't actually planning on having you ask her," said Dianne. "From rumours I've heard you don't always ask the girls you date if they want to fuck before you take them. Didn't Dad have to pay off one of them?"
"Don't believe all that you hear," growled Paul. "What you're suggesting is called rape. I can get into real trouble if I just grab a girl and help myself, so to speak."
Dianne shrugged. "I'd be a witness that she was willing," she said. "So will you or won't you?"
Paul laughed. "OK. If you can produce the girl, I can screw her for you. Do you want me to slip something in her drink so we can take our time while she's asleep?"
"No," said Dianne thoughtfully. "I'd rather she was awake and wriggling so that I can ask her some questions while you're screwing her. Oh, I also want to be able to see her face when you first stick your cock in her. Can we arrange that?"
"That's easy. We'll just put your cheval mirror in front of her so you can see me take her and watch her face in the mirror at the same time," said Paul. "Do you have any preferred method by which I fuck her?" he added sarcastically.
"I don't know any methods," protested Dianne. "That's why I want to learn."
"You don't think you're being too hard on this girl do you? I mean, setting her up to be raped might be thought a bit mean."
"She deserves it. She's nasty to me. She thinks she's so smart."
"I see. When and how do you intend to lure this young woman into our clutches?"
"I've asked her to tutor me on science and she's agreed. She'll be her in a few minutes," said Dianne.
"Today?" said Paul. "You left it a little late to ask me didn't you?"
"Oh, I was sure you'd say yes," replied Dianne. "Carla said you're the horniest bloke she ever went out with and that you'd fuck anything in a skirt. She's strange that girl. She told me to never let you go to Scotland."
Laughing, Paul told her to go and get the cheval mirror and to put it against the wall, indicating where he wanted it.
Shortly after that the doorbell rang and, answering it, Paul admitted Meredith into the house.
"Meredith," cried Dianne, "Just the person I've been waiting for. I've been talking about you to Paul and he's agreed to use you to help me with my sex ed."
"Excuse me?" said Meredith, puzzled. "I'm not sure what you mean."
"I need to learn more about sex," explained Dianne. "Paul has agreed to screw you so I can see how it actually happens."
"I think this my cue to depart," said Meredith, turning to head out the door, only to find Paul blocking her way.
"Sorry, Meredith," said Paul, smiling kindly at her, "but I did promise Dianne. Would you care to pull your panties down and bend over that chair so I can start the demonstration?"
"You're mad," said Meredith with conviction. "Step aside or I'll scream."
"That won't help. This house is sound-proofed. Double glazing on the windows and insulation in the walls. No-one will hear you. I assume you're not going to co-operate?"
"No, I'm not," Meredith spat. "Now get out of my way."
Paul shrugged and moved towards her. Meredith lashed out at him, only to find her wrist caught and twisted so that her hand was up her back and she was being forced back into the room. Holding her easily, Paul reached around and caught her other arm, drawing it behind her and holding both wrists in the small of her back. By turning her slightly and then lifting her arms, Paul casually bent Meredith forward over the arm of one of the easy chairs, facing the mirror.
"That was neatly done, Paul," said Dianne approvingly. "What's the next step."
"First I drop my pants," said Paul, matching deeds to words. "It's polite to let your partner know what is coming," he added, moving slightly to the side of Meredith so that she could see his reflection in the mirror.
"That thing of yours is quite large, isn't it?" said Dianne. "Are all cocks that size?"
"Mine's about average I think you'll find. Large enough to do the job wouldn't you say, Meredith?"
Meredith's answer wouldn't bear repeating. Dianne was appalled. "She shouldn't even know some of those words, Paul," Dianne exclaimed. "She's not taking this very politely, is she?"
"Did you really think she would?" asked Paul, incredulously. "I mean, I am going to rape her."
"All the more reason for her to be polite to you," pointed out Dianne.
"You logic fails me. Again. Now before I proceed I need Meredith's panties removed. Do you wish to attend to that?"
"Ok," said Dianne, moving over to lift up Meredith's dress and then pulling her panties down. "Now what are you going to do?"
"Well, before I take her I am going to stroke her pussy and play with it for a while. This is called foreplay. Do you know why I'm doing this?"
"According to the books, that's to make sure she gets wet inside. Is that right?"
"Correct. Now if you watch, you'll see how I stroke her pussy and slip my fingers inside her. If you watch closely you'll see her lips swell and darken."
Dianne watched fascinated as Paul commenced playing with Meredith, teasing her pussy, stroking and squeezing. She could hear Meredith gasping and swearing as Paul tormented her.
"Meredith," she asked, "what's it feel like when Paul does that?"
"That wasn't nice," she said after Meredith stopped speaking. "Paul, her bottom is bare. Can I smack her for being rude to me?"
"Go right ahead," said Paul. "Some girls like getting their bottoms smacked as part of sex. That may be why Meredith is being rude to you."
"Oh. I didn't think of that. OK. I'll smack her."
Dianne commenced to happily spank Meredith, blithely assuming that her wriggling and screaming was all part of the show.
Paul stood back for a few moments, watching and seriously wondering about his step-sister's mental abilities. He knew she was self-centred and vain but hadn't realised that she was also seriously mentally challenged.
"OK, Di. That's enough for now," he told her, stepping forward. "I'm now going to enter her, so why don't you stand back and watch as I do so."
Paul spread Meredith's lips, holding her arms slightly higher to ensure that she couldn't wriggle while he placed the head of his cock between her lips. He'd already determined that she wasn't a virgin and had no hesitation in driving himself firmly into her reluctantly waiting passage. Meredith screamed at the invasion while Dianne gasped.
"Goodness," she said. "It just goes straight in, doesn't it. Did you see how wide her eyes went when you did that?" she asked Paul.
"Not really, I wasn't worried about how she looked. Only how she felt."
"Oh. Why is she swearing again? She sounds really mad."
"Perhaps because I've got my cock jammed up her cunt and she doesn't want it there," suggested Paul, not believing his step-sister could be real.
"Oh. But I thought sex was supposed to feel good," protested Dianne.
"It does," said Paul. "Believe me, from where I'm standing, it does."
"Then you should make it feel good for her and then maybe she'll stop screaming. She's getting on my nerves."
Paul sighed. "All right. I'm now going to start pushing my cock in and out of Meredith. Once I build up the right rhythm you will probably notice her pussy and bottom moving in time to my cock. That will mean that she's enjoying it."