Later that evening, after the sex education lesson:

"So how was your sex ed.?" Matt asked as he lay by Lisa's side in bed that night, both of them totally naked. Matt had just finished a short bout of giving Lisa head. His right hand was slowly stroking her inner thigh while he used his left to prop himself up on his side. The room was totally dark, as always. Had the light been on, Matt would have seen Lisa's pretty round face, with a smattering of freckles, framed by her long, very straight brown hair that dropped below her shoulders. Matt had black hair that he kept short atop his slightly wide face.

"Pretty boring, same as ever. Ohhhh - did they teach you how to do that in class?" Lisa asked as Matt's fingers slid between her damp labia and found her clitoris.

"No, I already know how to push your buttons," Matt told her, and they kissed. Lisa's hand slid downwards and felt for Matt's cock, which was already hard. She broke off their kiss and rolled onto her back reaching out her other hand for a condom from the bedside table. She tore open the wrapper, being careful not to damage the condom, and handed it to Matt. He fumbled in the dark to discover which way up it went, and then rolled it down over his dick, feeling the familiar over-tightness of the latex.

Lisa spread her legs wide as Matt climbed between them. He used his hand to guide his sheathed prick into the right place and then tried to ease forwards.

"Down a bit," Lisa told him, and he did as she advised. Lisa gasped as she felt his head penetrating her, pushing open her vagina. Matt eagerly pushed deeper inside her until he could go no further. Still recovering from his entrance into her, Lisa wrapped her legs around his back and reached her arms around him to rest on his buttocks, leaving her entwined around him, clasped to him.

Matt began to thrust and they both grunted slightly on each thrust. They were at the opposite end of the house to Lisa's parents so there was little need to keep quiet, although neither of them usually made too much noise. Matt continued thrusting, trying to listen out for the subtle change in Lisa's vocal output in order to find the right spot that pleasured her. A dutiful boyfriend, Matt always tried to make sure that Lisa came first, especially since she was happy for him to keep thrusting to finish himself off after she had had her own climax. After a while, Matt stopped.

"I'm getting close," he explained, not wanting to come first. "Plus, I could do with a rest!" Lisa did not reply. "You ok?" Matt added after a few seconds.

"Yeah, sorry. I was just thinking about sex ed. again."

"Oh?" Matt said. It was not uncommon for them to talk during the pauses in sex. Sometimes it annoyed Matt, but it gave them a certain closeness that he liked.

"About the talk on rape. I was just wondering if I could actually stop you at this point."

"You'd only have to say so," Matt said, puzzled.

"Yeah, I know with you I would. But if that wasn't the case, could I get away? Just a silly thought, sorry."

"Why don't you try it?"

"What?"

"Well, don't hit me or anything, but just see if you could push me away."

Lisa unwrapped her legs and tried to get them into a position when she could use her feet to push Matt's legs away. At the same time she began using her arms to push at his chest and shoulders. "You have to try to stop me," she pointed out when she realised he was letting her do it. "Otherwise I'll just win."

"You'll win will you?" Matt said in a jokey tone as he tried to arrange himself to fight back. He began trying to move his legs into the right position but Lisa had a head start and was managing to push him away slightly, and she was twisting her torso to try and roll out from under Matt while she pushed him to the other side.

"Yep I'm going to win. No more sex for you," Lisa admonished him between heavy breaths. Becoming worried that his prick may get damaged in all this, Matt struggled harder and got his legs on top of hers and used his weight to hold her down. He grabbed her hands that were pushing at him and slammed them onto the bed, pinning them down to help stop her twisting underneath him.

"See," Matt said, and thrust hard into her. "I... win," he said, thrusting after each word. Lisa moaned loudly, with more emotion that Matt had heard from her before during sex, a deep primal moan. "You can't get away," he continued as he thrust, and Lisa kept moaning and groaning. He knew she was getting close now. "You're all mine now," he said as he continued fucking Lisa, while he held her firm against the bed. "Nothing you can do about it," he added. He pistoned in and out a few more times and she came with a long squeal, even as Matt finished himself off with some final hard thrusts.

Matt withdrew and straight away Lisa scrambled for her pyjamas as he tugged off the condom and tied it up - an acquired skill to be able to do it in the dark. Matt put his own pyjamas back on and then they lay on the bed.

"Hold me," Lisa said, and Matt snuggled up to her, spooning her until they both fell asleep.

Once Matt had found something new that Lisa liked, he tried to put it into practise whenever he could. It became a game of sorts, Lisa made a play of resisting each time until Matt held her down. It certainly made Lisa come sooner. A month or so later, Matt was staying at Lisa's again, on the Friday night before the carnival. The carnival was the highlight of the year in their town, and Matt and Lisa would of course be attending together.

They had now had "pin-down" sex, as Matt liked to think of it, five or six times. Matt found that he was beginning to enjoy it more than normal sex, although not as much as Lisa. Matt turned out the light and then rolled over and slipped his hand under the hem of Lisa's pyjama top, the usual beginning of their intimacy.

"Not tonight," Lisa told him. "I'm too tired. Maybe on Monday, after the carnival's out of the way."

"Normally, you aren't able to resist me anyway," Matt said. He'd meant it to sound tempting, but too much of his annoyance showed through and so it sounded churlish instead.

"Well, not tonight," Lisa answered, annoyed at Matt trying to take advantage of his newfound sexual trick, and slightly angry at herself that she enjoyed it, which made him right. "You don't own me," she added spitefully. They were both silent for a moment.

"Sorry," Matt offered. "I didn't mean it like that. I was just trying to tease you, it was silly."

"That's ok," Lisa said, and they kissed. "Besides, you can't hold me down during all the foreplay can you?" She laughed softly, to show that she was teasing him. She rolled away from him, to try to settle down to sleep.

"I'm sure I could find something to tie you down with instead," Matt said in reply and realised that it was in fact a good idea.

"Like what?" Lisa said, trying to not be rude but wanting to sleep rather than chat.

"The cord from our dressing gowns," Matt said, and he leaned over the side of the bed to feel for his gown. Lisa ignored him while he fumbled for a while. Matt finally found his gown, pulled out the cord and tied it into a simple knot around the bedpost by his head. Then he knelt on the bed beside Lisa, out of the way.

"Give me your hand," he told her. Lisa sighed, and rolled onto her back, holding her arm out for him to find in the dark. She knew that she would not get any sleep until he had finished showing whatever it was he wanted to show her. Matt gently moved her arm into position, and tied the cord around her wrist so that it was held next to the post. The large amount of extra cord dangled freely down the side of the bed. Matt got up and gingerly walked around to the other side of the bed where Lisa's dressing gown hung, and he pulled the cord out of that. He repeated his trick on the other side of the bed, tying Lisa's other wrist to the post by him, very pleased that he was managing all this in the dark. He bound Lisa's wrists so that it would not hurt, but she would not be able to wriggle out of the ties.

"Happy now?" Lisa asked wearily. "You've shown that you could tie me up."

"Shhhhh," Matt said as he clambered back on to the bed. "People who are tied up don't get any say in things." When he said that, Lisa's heart began beating a little faster. Matt straddled her waist and kissed her.

"What do you mean?" Lisa asked.

"I get to do what I want now," Matt said, smiling in the dark.

"Such as?" Lisa asked, getting a little nervous. Suddenly she was much more awake.

"Turning on the light," Matt said, and he leaned over to turn on the bedside light. Lisa quickly shut her eyes as the light went on. Even through her eyelids she could see the red glow of the light.

"Can you turn it off now?" Lisa asked, her eyes scrunched up.

"I'll decide when it's turned off," Matt said self-importantly.

"Well as long as it's on," Lisa said with an air of resignation, "can I least have that sleeping mask in my drawer to keep the light out?"

"Ok," Matt said, and he reached for the sleeping mask.

"You'll have to put it on for me," Lisa said as she lifted her head from the bed. Matt slid the sleeping mask on, and everything went nice and dark again for Lisa. "Now what?" she asked, with mixed emotions of annoyance, tiredness and slight unease. She felt his fingertips on her sternum and then felt her pyjama top slip away to each side as he undid a button. She waited, her heart beating quicker, until Matt undid another button. "Don't," she said weakly, almost a whisper. She did not know whether he heard her half-hearted protest, but he unbuttoned the next button down, the one between her breasts. She squirmed subtly, feeling very awkward as he continued undoing all the remaining buttons. She felt the two sides of her top being tugged away, leaving her chest totally bare. Her heart was pounding now as she imagined Matt staring down at her.

Matt looked down in wonder. Lisa had always made him keep the lights off whenever she was undressed, so paranoid was she about him seeing her body. But now, for the first time, he gazed upon her beautiful breasts and cute stomach, and wondered why she had gone to such efforts.

"You're beautiful," he said honestly. He stroked the outer curve of her right breast with his hand, marvelling at the sight of the orbs that he had caressed in the dark so many times before. "Really beautiful," he added. Lisa moved her head up slightly and he bent over to meet her lips with his, kissing deeply, her tongue shooting out to enter his mouth in a passionate exploration.

When they finished kissing, Matt shifted backwards so that he was sat between her legs. He ran his hands slowly down Lisa's sides and stopped when they were on her waist, his thumb and fingers spread wide apart, resting on the waistband of her trousers. Lisa's heart continued to pound inside her chest. She knew what he was about to do, and knew that with a word, she could stop him, but she said nothing. She waited.

Matt tucked his fingers inside Lisa's waistband and slowly pulled down her trousers. He tugged them free of where her bottom lay on them, and then drew them down her legs, moving backwards as he did so until he was standing at the edge of the bed, holding her trousers in her hand. He dropped them as he gazed on the sight in front of him. Her legs were as beautiful as the rest of her body but his eyes were inevitably fixed on her groin.

She had a thick bush of pubic hair, which looked much fuller in the light than it felt in the dark. It was black, or possibly dark-brown, and obscured all the detail of the delights that lay beneath it. Matt sat down on the bed between her legs again and eased the tips of his thumbs between her labia before slowly prising them apart. The inside was a complex mess of folds of skin that looked more detailed than it had felt to his blind finger and tongue.

"Does it look strange?" Lisa asked uneasily, feeling very vulnerable. She was tied up, blindfolded, and forced to wait while her boyfriend inspected her most private region in the seemingly clinical manner of a gynaecologist.

"No, it's fine. Perfect." Matt took his hands away, and then picked up her thighs and lifted them up without any resistance from her. He pushed them up over her body until he could see her bottom. He saw Lisa's tiny perfect asshole, with its wrinkled and very slightly discoloured surroundings. He noticed that it was only an inch or two from the bottom of her vagina; much nearer than he had imagined, even having seen some naked women on his computer before.

"What are you doing?" Lisa asked. She was becoming more anxious now that she had fully realised her helpless predicament, with no idea of what Matt would do.

"Nothing," Matt said as he let her legs back down. He shifted to lie with his head between her legs, and began kissing the springy hair in front of his face. Once he had parted her lips with his fingers and began lashing his tongue around her clitoris, Lisa finally start to relax. This was familiar and very enjoyable territory.

Rather than the usual darkness, Matt's view was filled with pubic hair and the sight of Lisa's twin mounds collapsed onto her chest. She seemed to be getting wetter much more quickly than usual. When Matt paused to catch his breath, he could see her juices running down from her vagina to between her buttocks. When he bowed his head again to resume licking, he casually placed his spare hand against her buttocks. As he continued licking, he extended his finger outwards.

Lisa shifted her weight slightly. Matt had just accidentally placed his finger on her asshole. It felt quite strange but she did not bother to say anything.

Matt's finger was sticky with Lisa's natural lubricant, and he could feel the ridged skin of her hole beneath his finger-tip. His heart pounded as he waited to see if Lisa would protest to the presence of his finger. When she said nothing, he pushed forwards until suddenly his finger was inside her. It was warm and tight - incredibly tight. He could feel all her muscles straining against his finger to push it out, and his dick swelled, as if the muscles were pressing on his prick instead.

Lisa gasped as his finger slid inside her ass. It was a weird feeling, and not pleasant. It was an intruder in a place that it should not be, and where nothing foreign had ever been before. She could feel herself straining to push out the finger but it was to no avail. Lisa tried to ignore the strange sensation and concentrate instead on Matt's tonguing, which had not let up the entire time. She would complain about his finger after her climax, which had not been far away.

Lisa definitely seemed more subdued in her pleasure after Matt had inserted his finger but he was determined to try to make her come without removing it, no matter how long it took. Lisa felt in turmoil - part of her body was receiving a lot of pleasure, but another part was very uncomfortable and ill-at-ease. Slowly the pleasure began to take over, and she began to moan and buck her hips as her long-overdue climax began building. Her ass was squeezing tightly, and suddenly it felt sort of good, like the feeling she got when Matt was fucking her vagina when she came, a similar fullness... and stretched sensation... ohhhh...

Lisa came loudly, almost shouting as she finally achieved her release, the pleasure heightened by many factors - the blindfold, the binds on her wrists, and the finger in her ass. Matt was shocked at how loud Lisa was and how much she seemed to be enjoying the predicament he had placed her in. As she lay still, her chest heaving as she recovered her breath, he pulled out his finger and wiped his hands on a tissue before freeing her wrists, and handed her pyjamas to her before turning off the light and getting into bed.

"That," Lisa said, "was very naughty of you." Matt wondered if she meant the tying up, the lights or the finger but decided not to ask. She moved over to snuggle Matt and in the dark, under the covers, her hand bumped against his unreleased erection. "I see you enjoyed that too then." She slipped her hand inside his waistband and took hold of his cock. "Didn't you?" she asked huskily as she began to stroke him.

"Yes."

"Are you thinking about it right now?" she asked as she continued to stroke.

"Yes."

"Good," said Lisa, reaching for a bundle of tissues from the bedside table with her spare hand. "I want you to come, thinking of me naked." She held the tissues against the head of Matt's dick while she pumped hard. It did not take much time, and Matt came long and hard into the tissues, groaning as he finally achieved release, picturing her beautiful uncovered body in his mind. Lisa disposed of the tissues and they both settled down to sleep, totally exhausted.