Dan sat stared out of the airplane window. This was going to be the last time, he thought to himself.
When his parents had suggested he come away with them, he'd had to give it some serious thought. On the one hand, two weeks in a private villa in Greece sounded pretty sweet. On the other, there was the fact he was 22 and in his last year at uni; a little old and, in his mind, independent to be going away with mum and dad.
Then, there was his little sister.
Four years younger than him, she had just turned eighteen a few days earlier. His Mum had sold him on the trip by guilt-tripping him about it being 'one last family holiday' and 'a nice way to celebrate Erin's birthday, who you don't see enough of anyway.'
To be fair, his mum was right. He hadn't been able to make it to Erin's eighteenth because of uni exams, and before that he'd probably only seen her once or twice in the last six months. He lived away from home and, to be honest, they didn't have much in common. He liked sports and she liked books. He liked going out, getting drunk with his mates and she had her internet forums, whatever it was she was doing on there.
But he did feel guilty.
As the older sibling, really it was his responsibility to make the effort and show some maturity.
Christ, he thought, that's mum talking.
He turned his head from the small airplane window, where huge clouds towered, and glanced down the row at his sister, Erin. She didn't look eighteen to him. She was wearing small round glasses and tendrils of long, brown, wavy hair tumbled down the side of her face to her soft, slightly rounded cheeks; she was sucking a strand as she read her book, her pale legs drawn up onto the seat. She had dressed for comfort, and was wearing nylon shorts with a slight cut in the side; they were a little too short in Dan's opinion - as they were boarding he'd noticed you could almost see the bottoms of her buttocks beneath the flapping shorts material, but whatever kept her cool, he guessed. Up top, she'd chosen a loose grey jumper that hung off her pale, white shoulder on one side, and buried the rest of her upper body in soft, comfortable folds.
Mum's right though, Dan thought, I do need to make more of an effort.
'What you reading?' He asked her, quietly. In the seats between, their Dad was dozing lightly.
'Nothing you'd be interested in' she mumbled, without looking up.
'I wouldn't be asking if I didn't want to know' he snapped back, annoyed that his effort was being so poorly repaid. She looked up from her book, her green eyes flashing with annoyance, her cute pink lips twisted into a sarcastic smirk.
'Ok then, it's hard science future history set in the 24th century that takes a realistic look at the possibility of human beings expanding across the solar system. Happy now?' She got up suddenly, her loose nylon shorts flapping across the slight curve at the base of her smooth, pale buttocks, her hair tossing in the sudden movement, and stormed down the central aisle towards the bathroom.
This sass was a new side of her that Dan hadn't seen before. He liked it. Perhaps reconnecting with his sister wouldn't be so bad after all.
*
When they arrived at the villa, Dan decided that he'd definitely made the right decision.
It was a four bedroom villa, split across three levels. The ground floor housed the open plan kitchen and living space, which led out to the private pool area, surrounded on two sides by tall pine hedges, whilst the fourth side gave an uninterrupted view out across the deep blue Ionian sea.
The first floor was where the bathroom and master suite were located, whilst the final level was home to two extra bedrooms, each with their own private balcony, where he and Erin would be sleeping. Their bedrooms were separated by a folding door which could be simply locked from either side.
'Wow, this is so nice', their mum said, wandering out through the wide glass doors to stand poolside, looking out to sea.
'Dan, give me a hand with the cases will you.' His dad shouted. Dan went back out front to help carry the cases from the waiting taxi. As he headed for the door, he saw Erin dashing upstairs excitedly, 'I'm going to check out my room, mum' she called.
Dan's Dad handed him both his and Erin's cases, saying 'Just run these up to your rooms will you then come back for some more'. He grabbed them and went back inside, jogged up one set of stairs and then the other. At the top of the stairs there were two doors, side by side, and both were shut, so he dumped the cases on the landing and, without thinking, grabbed the door handle on the right and burst in...
It didn't occur to him until the last minute that you don't just burst in to a teenage girl's bedroom. He was so used to living with guys at uni that the social niceties of living with family had momentarily escaped him.
As soon as he opened the door he heard a strangled 'urgh!' Erin was standing by the bed, facing away from him. She had removed her jumper and had one thumb hooked into the waistband of her shorts. Her wavy brown hair fell across her smooth, silken, pure white back. Dan's eyes couldn't help following the cleft in the centre to the point that it disappeared beneath her shorts, and fixating on the two cute dimples to its left and right. She wasn't fully turned away from him, and he saw the curve of her midriff, from hip to ribs, and the suggestion of a breast, side on but full and heavy and white as milk.
'Get out!' She screamed at Dan.
'Oh god sorry!' He shouted back. 'I was just bringing you your case.' There was silence for a moment.
'Just leave it there' she shouted back, 'and go!'
Sheepishly, he turned to go back downstairs. 'I really am sorry' he shouted back.
It wasn't until he got to the bottom of the first flight of stairs that he realised something wasn't quite right. He was hard.
He ran into the bathroom and locked the door. 'Dan? Dan?' His mum shouted from downstairs.
'Just in the loo mum' he shouted back, 'won't be a sec.'
He looked at himself in the mirror. You're hard for your sister, he thought. It was something he'd never fantasised about, never entertained. Incest was a word he'd heard bandied around in late night uni discussions about porn, but at that time the thought had disgusted him. Until now.
The image of Erin's pure white back and the roundness of her tight, young ass through her shorts; her toned thighs and slender calves; the soft curve of her breast; these images were burned in his mind.
Without thinking he walked to the toilet, pulled out his rock hard cock and pumped it furiously until he shot his load all over the tiles, thighs quivering, nearly buckling. It was the most intense orgasm he'd ever had.
