It was summer vacation, so Alex was home from college. He was playing video games in the afternoon when he heard the front door open. No one was supposed to be home, so getting up from the computer he walked into the front hall to find his older sister Liza there. He hadn't seen her for a few months since she had gone back to grad school, and she looked...different. Gone were the sweatpants and baggy tops. She had on tight yoga pants and some sort of scooped top that showed her breasts. She stepped forward and hugged him, her full breasts pushing against his chest.
"Hi my favorite brother. Miss me?" She stepped back outside the door and turned around, her pants clinging tightly to her body as she bent over to pick up her bag.
"Nice ass," Alex thought and stepped back so she could enter. He tried not to look down at her breasts as she moved past him, her long dark hair cascading over her shoulders.
"Mum and dad are not here," he said. "They're at the beach. Back in four days".
"I know," she said, "originally I wasn't going to be here until next week. But....stuff happened....my plans got changed so I came home early."
He watched as she walked up the stairs to her room.
***
He was making himself a sandwich when Liza came into the kitchen a few minutes later. She had changed into a yellow bikini which didn't leave much to the imagination as it was barely large enough to contain her breasts. She walked to the fridge, took out a soda and sat down on a bar stool facing him across the island counter.
He tried to concentrate on his sandwich rather than on the expanse of smooth creamy flesh in front of him.
"So how's college," she asked, taking a sip of the soda. "Grades ok? Lots of nice girls to date?"
"College is good," he replied. "I'm not really dating anyone. Too much work."
She asked again. "You're really not seeing anyone? "
"Well... there is a girl... a friend I've sort of been seeing...Jill. In fact I've a date tomorrow with her. She lives here as well."
Liza stood up, putting the soda can in the recycling.
"I'm going to get some sun," she said. She walked over to the wine rack and took a glass from the cupboard and a bottle of wine from the rack and opened the door to the patio. He watched as she walked away, the contours of her tight body accentuated by the bikini. He hadn't realized how good looking his sister was.
***
Later that afternoon Alex was in the laundry putting some clothes in the washer when he happened to look out the window. He could see Liza lying on a lounger by the pool, facing him. She was drinking a glass of wine. As he watched, she put her glass down, looked around and seeing no one picked up a towel and put it across her lap.
And then she slipped a hand under the towel, opening her legs wider.
He'd never seen a woman touch herself before.
He watched, riveted, as Liza masturbated for a few minutes until she whimpered and thrust her hips forward a bit, the towel falling to the ground, to reveal her bikini bottom pulled aside and her fingers on her clit. As her orgasm drew near, she inserted two fingers into her pussy, moving them in and out with some speed. When it was over she lay there, her pussy still on view, before she realized where she was and pulled the fabric back to cover her sex.
She checked that no one was watching, and then she slipped her fingers inside her bikini bottom. She was aroused, wet, in need of an orgasm. She hadn't had sex in over a week, since she'd caught her former boyfriend fucking his former girlfriend. And of course she had to leave his parents' condo after the fight...but she was angry at the betrayal, frustrated and only the release of a climax would help. So she pushed the swimsuit aside, closed her eyes, imagining that she was being touched by a man, and the first face that came to mind was Alex. "God , I'm a pervert," she thought as she speeded up the friction of her fingers on her clit. " He's just a boy...and he's my brother." And as she neared climax, she inserted several fingers into her pussy, imagining that it was a cock, a hard cock fucking her ...and then she was over the top, her vaginal muscles tensing on her fingers, again and again.... in the aftermath she realized the towel had fallen to the ground, and her pussy was completely exposed, so she pulled the bikini back into place.
Alex was hugely excited by what he'd witnessed. He took his engorged penis in his right hand and began to stroke it. He was as hard as the first time he'd seen a porn movie. He imagined holding his cock over her breasts and he imagined Liza undoing her bikini top and holding her breasts up. He imagined his cock sliding between her breasts, the purple swollen head emerging with each stroke. He imagined being between her legs, thrusting into her as she writhed beneath him, her legs wrapped tightly around his body. He imagine her on top, her breasts jiggling as he thrust up into her wetness. He imagined exploding in her cunt as they came together, pumping his seed into her warmth.
He was close so he seized a towel from the laundry hamper and positioned it on a chair in front of his cock. As he stroked himself faster and faster he imagined once again his cock sliding between her breasts and he tried to imagine what it would feel like in that tunnel of warm soft flesh....and with that his buttocks tightened, he ejaculated and the warm, sticky fluid flooded over his hand and into the towel.
Ashamed of his desire, embarrassed at the fantasy of fucking his sister, but now satiated, he wiped his penis clean, washing his hands and putting the towel way down in the laundry basket.
***
He was in the kitchen making coffee when Liza came in from the pool with the half-empty bottle of wine. "What do you want for dinner?" she said. "Takeaways? Thai? Chinese? Pizza?"
They opted for pizza and Liza went upstairs to change. When she came back down, she had on shorts and the top she'd worn before. He was relieved that she'd changed, hiding the distraction of her body.
When the pizza arrived he paid for it and came back into the kitchen. She poured herself another glass of wine and he found a beer in the fridge. They talked desultorily about nothing in particular, but all the time he found himself staring across the table at her spectacular breasts.
"Hullo? Earth to Planet Alex?" Liza said, noticing where his eyes were aimed, and smiled to herself.
"Sorry...what were you saying?" Alex asked, not wanting Liza to know what he'd been thinking about. "I'm a bit tired...I think I'll go to bed."
Confused by the desire he felt, his cock still aroused, unclear about what to do, he bade Liza good night.
"He's a man now," she thought. "Not the kid I baby sat. I wonder if he and Jill fuck. I probably shouldn't tease him by wearing a bikini."
She liked that thought though, the idea that her brother could be turned on by her body; in the last semester she'd come to appreciate just how easy it was to use her attributes to influence a man.
***
It was dark when he awoke, his bladder full, needing to use the bathroom. On returning to bed, he lay there in the darkness, half asleep, his hand naturally caressing his cock. He thought about masturbating again, by imagining that one of his favorite porn stars was sucking his cock but all he could think of was Liza, Liza taking his cock in her mouth, Liza on her knees being fucked from behind by him....
this is wrong, he thought, it's incest, I can't think about that
....so he took his hand away from his erection, turning on his side to sleep.
