Ann-Marie had a plan, one she had been working on for nearly two years. She had played out different scenarios in her head, keeping some parts and discarding others. Central to her scheme was Dominic, her twin brother, and today was their eighteenth birthday. He was by far the easiest of her two targets she had decided, and if she could manipulate him, then the path to her main prize was closer. For years they had fought like cat and dog, but once the idea was in her head, Ann-Marie had subtly changed, becoming more approachable and acting as though she was a concerned sister.
She knew that he was out with his friends that evening celebrating, certain that he would return home worse for wear, or at least she was hoping he would. Ann-Marie had dressed for his return, which in itself was a joke because beneath the silky robe she was wearing, she was naked.
Stumbling through the door, it was late, and Dominic was drunk. He had been expecting everyone to be in bed, asleep, surprised to find his sister still up and about. He was even more surprised to see her wearing a robe; normally it would have been full pyjama bottoms and a t-shirt top. She was chatty, but fidgeted constantly, seemingly unaware that as the robe slid over her skin it gaped in places and gave him constant views of her thighs, the "V" of her groin, and the ponderous edges of her ample breasts.
His friends mentioned constantly that she was pretty, fit, and sexy, but Dominic had never noticed, at least not until that evening. He wasn't going to admit to anyone, and especially not to her, that he was still to get his end away, but the constant views of her body suddenly had his dick twitching. They were right in what they said, despite her being his older sister by five minutes, as females went, she wasn't bad; in fact, in part, due to his beer goggles, she looked bloody good.
Ann-Marie pretended not to notice her brother's lecherous glances, while Dominic pretended not to look at her as she bared sufficient flesh to tantalise and tease him. It was hard not to miss his hard-on, the bulge in his pants, looking quite enticing as she fluttered her eyelashes in his direction and gave him another view of her cleavage. When she was ready to go upstairs, she made sure that when moving her legs, he got an unobstructed view of her fanny. It would give him something to think about as he went to sleep, she determined, and that was if he didn't pleasure himself first.
Over the following month, she kept up the pressure. Most evenings they would both be out separately, but Ann-Marie ensured that they would end up at the same venues, or that she would be nearby at the end of an evening, so that they could walk home together, often with her arm through his. Dominic's mates were never going to complain, especially when she turned up with two or three of her companions; they were all attractive and sexy and kept his friends occupied while she teased her brother.
At home and when Dominic was around, she cajoled and flirted, dressing provocatively and often leaving the bathroom or her bedroom door slightly ajar, allowing him to catch glimpses of her partially dressed, or wandering around in her underwear. She knew by now that he was watching, the constant bulge in his pants, a sign that he was interested.
She hadn't said anything, but Ann-Marie knew a pair of her panties had disappeared and she guessed who the likely culprit was. She didn't mind; she was gratified; it meant that he was thinking and fantasising about her as she imagined her brother grasping his cock as he tossed himself off. What she needed to engineer next was a situation, an opportunity to push the envelope a little bit further.
Fortune smiled on her one afternoon several weeks later. She worked behind the cosmetics counter at one of the department stores in town and it was her half-day because of having to work Saturdays. Both her parents would be out at work, Dominic would be at college, and she was looking forward to the house being empty when she arrived home.
When she entered through the back door, silence reigned; kicking off her shoes as she padded into the lounge in her stocking feet. 'Two minutes,' she thought as she stretched out on the couch, just wanting to rest her legs after being on the go all morning but not wanting to crease her uniform. She lay with her eyes closed for a minute, her ears noticing very faint sounds occasionally, but unable to pinpoint where they emanated from. Suddenly a floorboard above her creaked minutely, a quick rush of fear making her sit upright as she looked up to the ceiling, remembering that her brother's bedroom was directly above the lounge. By rights he should be at college, Ann-Marie wondering if he was skiving. Climbing to her feet, she opened the lounge door as softly and as quietly as she possibly could, and then tiptoed up the stairs, avoiding the ones that creaked.
Creeping along the landing, she could now hear the sounds coming from Dominic's room, noises that could only mean one thing if she were guessing correctly. With the door partly ajar, she peeped down the edge, where the hinges were attached. She couldn't see his upper torso, but what she could see of his lower half was naked, his cock sticking upright, and with her panties wrapped around its length. The sensations started in the pit of her stomach and moved downwards as she watched her brother's fingers tease the plump knob and moan softly.
As he masturbated, she found one hand drifting to her groin, pulling up the front of her skirt and easing inside her panties. When she stroked her pussy, her legs wobbled; this was the perfect opportunity she thought, all she needed to do was push the door open.
Despite all her planning, it still took a moment to summon the courage, would Dominic scream with rage when she entered? Taking a breath, she eased it open; her brother had his eyes closed, and what he was doing to himself distracted him sufficiently to not notice her standing in his doorway.
'Are those my panties?' She asked quietly.
The look on her brother's face was one of panic, followed by embarrassment, followed by humiliation as his hands tried to hide his cock and her panties wrapped around it.