They sat in silence for a while. Then Tessa reached across and took hold of Matt's left wrist. She drew his hand towards her, placed it gently on her right breast, and kept it there. He looked at her, startled.
"It's OK, Matty, just hold it there for a while."
She was wearing a loose, knitted cotton sweater which rather hid her figure, and under that a bra. But still he could feel the weight and softness of her breast, the small movement of her breathing, perhaps the slightest hardening of her nipple.
"Feels nice, doesn't it, Matty?" He could not speak. "They're natural," she continued, quietly. "Big and soft and heavy. They move with me. They need a good bra to support them, and that's more expensive in the bigger cup sizes. They bounce when I run, which is why I don't run much, and swim to exercise. They swell a bit before my period, feel tender. They make my back ache sometimes. The nipples get hard when it's cold, or when I'm horny, or for no reason. They're real breasts, Matty. Three dimensional. Living. You like them?"
Almost inaudibly: "Yes ... yes ..."
"Would you like to see them?"
"Yes."
She stood up, facing him. She pulled the sweater over her head and off, revealing a burgundy-coloured lacy bra on her pale torso. She reached behind herself, unhooked the bra, placed it on a chair. She stood with her hands on her hips, drawing her shoulders back and down to push her naked chest out. She was not much above five feet tall, with a slim, well proportioned frame, and those great breasts jutting provocatively towards her brother. He was spellbound, open-mouthed, breathing hoarsely. Tessa could see a bulge in his sweatpants. She spoke very softly. "Nice to look at, aren't they, Matty?" He could not speak. "Would you like to suck them?"
He knelt upright on the floor in front of her; it brought his face level with her chest. He took one breast gently in both hands, guided it to his mouth and started to suck, softly but insistently. She stroked his head, whispered to him. "That's right, Matty, have a nice suck. Your big sister's big titties, eh? All nice and warm and soft with big thick nipples. So nice for you to suck. Just like you've wanted for years, Matty." He let the one breast slip from his mouth and moved to suck the other. They stayed like this, silent, Matthew moving every so often from one breast to the other, for a long time.
After a while, Tessa reached down, took his hand and placed it in her crotch as she stood with feet apart. Even through the thick denim of her jeans Matthew could feel the heat of her arousal, perhaps even dampness. He began to detect a heavy, musky scent. "Can you smell that, Matty? That's my pussy, getting turned on, getting wet." She rubbed her crotch against his hand. He could definitely feel moisture now. "Would you like to see that, too?" She did not wait for a reply, but stepped back so he let go of her breast with his mouth. She held his shoulders, guided him to sit up on the bed again. She took off her jeans, and the plain black panties she was wearing, and stood before him completely naked. "There, you see? Big sister's hairy pussy." Her pubes were dark brown, luxuriant, trimmed just enough for a swimsuit. "Not like on the internet, eh, Matty? Not like those shaved doll-women you've been looking at. A real woman's hairy cunt." She stepped closer to him, placed his hand between her legs again. "Be very very gentle, Matty, everything there is very sensitive, but you can explore, have a nice feel."
Very very tentatively he probed the soft wet convolutions of her flesh with his fingertips. She carried on whispering. "Not just a slit and a hole, is it, Matty? It's a special, secret place, folds within folds, all wet and warm. That ... just there ... that's my clit. Be ever so careful there. Aah, yes, that's nice, good boy Matty. You're good, Matty, gentle and sensitive. Your girlfriends will like you for it one day. Move your hand a bit further in ... yes ... that's it ... your middle finger is just on the opening, just there. Small, isn't it? Amazing to think that a man's cock can fit in there. But I get so wet it slips in, no problem. Careful ... careful ... that's it, back to my clit, you can feel I like that ... good boy Matty, good boy ... I bet you'd like to put your cock inside me, wouldn't you, Matty, eh? You'd like to feel all that warm soft flesh wrapped tightly round your prick?"
He was beyond speech now. His cock was straining and chafing against the inside of his underpants.
"Get undressed and lie on the bed, Matty."
Hurriedly he stripped off the jogging pants, sweatshirt, underpants. He lay on his back, his cock jutting grotesquely from his slim, naked body.
"Gosh, Matty, you've got a nice one. Big, and nice and thick. You'll fuck lots of girls with that, Matty, they will love your big thick cock. But first of all you're going to fuck your big sister."
She climbed on to the bed and straddled him, kneeling upright. She took his cock in her hand and used the tip of it to tease herself for a while, rubbing it along the slick cleft of her cunt. Then a slight change of position, an instant's pause as she got the spot just right, and she bore down strongly on him, taking him all the way inside her. He let out a whimpering moan. She reared up above him, breasts swinging, and ground her hips slowly and sensually. He could feel her wetness on his balls, the tight grip of her vagina on his shaft, the head of his cock so deep inside her. She began a steady rocking motion, creating friction on his glans in the depths of her body.
"You like that, Matty? You like fucking your big sister's tight wet cunt?"
She reached down with one hand, worked her middle finger between her pubis and his to find her clit, started to frig herself as she rode him. Her movements got faster, less gentle, less about teaching him and more about pleasuring herself. She rode him hard now, frigged herself hard, bucked her hips up and down on his cock, whimpered, gasped, and came.
She yelled as the orgasm hit her. "Oh fuck, oh my fucking God, oh Matty Matty I'm coming, oh fucking yes, oh your fucking cock, oh yes!" Her vagina throbbed and pulsed around his dick. It was too much. He groaned loudly as what felt like the most cum he had ever produced in his life spilled from his straining cock deep, deep inside her cunt, inside his sister's body. More spasms, aftershocks for both him and her. Her cunt seemed to want to squeeze the last drops from him, seemed greedy for his cum.
Silence. Still she sat upright, on top of him. His erection just began to subside. He could feel that it was bathed with his own sperm, inside her.
"Matty, could you pass me some tissues?"
He reached to the tissue box at his bedside, grabbed a handful and passed them to her. Slowly she dismounted from him, immediately pressing a tissue to her crotch as the cum started to flow from her. She knelt with her legs apart, dabbing and wiping at herself. His cock was still swollen, and sticky from her juices and his spunk. He lay quite still and looked at her. She got off the bed and tenderly placed the bedclothes over his naked body. "I think you need to lie quietly for a bit, Matty. Let it all sink in."
She put her clothes on. He watched every move as her glorious body was concealed again under cotton and denim. "I'm going to go and finish sorting out my things, Matty. We will not do this again, you understand that, don't you?"
"Yes ... yes of course. Er ... Tessa ..."
"Yes?"
"Thank you."
"Don't thank me, Matty." Her voice, while still calm, now had a steely edge to it. "You really shouldn't thank me. You don't get it, do you? I have ruined your sex life forever, before it's had a chance to even start. Every time you get near a girl now, you will think about fucking me. Your sister. You start going out with someone, it's her first time, she asks you if it's yours, you think no, I've fucked my sister. You're at college, drinking with the lads, swapping sexual anecdotes, what about you, Matty? You're the boy who fucked his sister. You get into a relationship, you get to that stage where you're telling each other about exes and first times. And yours? Your sister. You will never, ever have any kind of a normal relationship. The image of the time you fucked your sister will never leave you. It will be there every time you masturbate. Every time you look at a pretty girl, the picture of me riding your cock will blot her out. You may not have been a pervert before, but you are now. Because you have fucked your sister. Don't cry, Matty, that does no good. You shouldn't have messed with my stuff, Matty. Shouldn't have touched my stuff."
