It is highly recommended to read the previous story, 'This must never happen again! Right?' it will give you the background information for the following story but here is a short synopsis anyway.

Matthew and Sarah Jones are brother and sister but they have entered a whole new forbidden world. It started when Matthew was in a bad mood and Sarah was angry at being dumped for a hot date (she had done some extra special shopping for that date). The atmosphere was tense and it was only a matter of time before everything blew up.

A silly argument started over a CD and it soon led to a pushing match. Sarah fell on the bed removing Matthew's towel (he had just showered) and soon found her self face to face with his penis. No guesses what happened next.

After a short time they had an uncomfortable little talk until they realized that they could not hold back any longer and the obvious happened. If you want to know more about that you'll have to read the previous story and vote on it! Positively, please.

The story continues...

After their first incestuous adventure they soon found it was impossible to stop. Any hint of guilt had soon been banished by the passion and orgasmic pleasure they found with each other. Their sex was hard and fast, just how they loved it. Inevitably though, a short time though later their twisted minds were already playing with new ideas. However they weren't quite sure how to suggest it to each other.

Being older and more experienced Sarah had the idea first. The sex was great but a little predictable. There was always lots of oral and she got fucked in her pussy and in her ass, now she wanted something a little different.

She had had the idea when she remembered her shopping trip. She hadn't used any of that stuff yet and couldn't wait to reveal her sexy new outfit. It seemed a shame not to use any of it.

Sarah thought long and hard about it (the idea and the sex), fleshing out the details and coming up with some plans that she thought both of them would appreciate. First of all she would have to come clean about her shopping trip. That could wait for breakfast the next day.

Sarah woke up and went to the kitchen to get some breakfast. She was nervous, even after everything she had done with her brother.

Matthew walked in to the kitchen, he could see she was on edge but gave her a moment before he would ask her about it. He prepared some breakfast for himself and joined her at the table.

"All right there, sis?"

No answer.

Matthew repeated the question.

After a pause Sarah replied quietly, "Matthew, I'm fine but can I talk to you about something?"

Matthew just nodded.

"Thank you Matthew, can you meet me in my bedroom in ten minutes?"

Matthew nodded again.

With that Sarah left the kitchen and proceeded up the stairs to prepare her little surprise.

Matthew was curious, thinking that maybe she was horny again but it couldn't be that, she would have done him right there in the kitchen. He wouldn't have minded.

Matthew finished his breakfast and washed the dishes, he had to give her the ten minutes she had had asked for. In that time his imagination worked overtime, he wondered what else he could do with that great body of hers.

The ten minutes came round all too slowly and when it did he ran up the stairs and knocked on her bedroom door. That was strange in itself, Sarah had never closed her door since the first time they had slept with each other. What was she hiding?

Sarah opened the door and invited him in to her room.

Matthew sat on the bed noticing the bag next to him, he tried to peek in but Sarah stopped him straight away.

"Matthew, thank you for waiting for me, I am sure it was difficult."

The atmosphere was tense and Sarah was looking down at the floor.

"Matthew I think we need a little talk about what has been happening. Don't you?"

This was the conversation Matthew didn't want to be having. He knew what had happened wasn't right but it was too good, unfortunately he could tell from his sister's manner it could all come to an end. His eagerness turned to disappointment.

He couldn't speak and could only nod his head to confirm what she had just said.

Sarah saw his face change and how quiet he got. When he nodded to answer her question, she looked away from him, with an evil smile on her face.

"Bruv, the sex has been really great but I feel we can't continue like this any more. We've gone too far, it never should have happened."

Now Matthew could only look down at the floor, he had to expect this didn't he? He had to admit it had lasted longer than he thought it would. He would have to say something and get out of there.

"Sarah, I'm not sorry it happened but I'm sad it has to end. The best thing would be for me to leave right now and please give me some time to sort my head out."

He got off the bed and went to leave the room but was called back by his sister. He was shocked to see her crying with laughter. Now he didn't know what to think.

Sarah went up to him, took his hand and led him to the bed. She kissed him softly on the cheek and he sat down a little stunned and perplexed. His brain was wondering what the hell was going on.

Matthew could see that Sarah was back to her normal self and he relaxed a little, but in the back of his mind he felt a little scared about losing the relationship he was having with his sister. He was relieved when Sarah went on to explain her actions.

"Sorry Matthew, I couldn't help it, I didn't mean to be such a bitch but the moment just took me. The thing is, and don't take this the wrong way, I want us to make some changes."

Matthew, a little confused, had to ask. "What changes?"

Sarah continued, "I want us to experiment a little, we've come this far and I don't want to stop. I want more! The contents of that bag will explain it a lot better than I can. Open it and see for yourself."

Matthew opened the bag and emptied the contents on the bed; he could only stare at the magical possibilities that lay in front of him.

On the bed was a small bottle of champagne, a jar of chocolate spread, some lubricant, some ropes, handcuffs, a blindfold and a small whip. Sarah was right; the contents of that bag were self explanatory. Just what sort of sister was she?

Sarah continued. "These are the rules, if you agree of course. No sex until tomorrow night and in the meantime I want you to imagine what you could do with me and the contents of that bag. I think you can do that."

She gave him a little time for everything to sink in.

"Matthew, please listen to this, it is important. I am expecting at least one new sex act you can perform on me and I will think about what to do to you." Sarah added with a playful little smile on her face.

Matthew was shocked, first of all everything was going to end and now his sister was kinkier than he ever thought possible.

He was eager to do his research on his new task, the internet being a wonderful research tool, but felt compelled to tell his sister what he had been dying to tell her.

"Sis, thank you. I've been dying to tell you all the things I've wanted to do that body of yours and now you've given me the chance. You won't be disappointed!"

With that he left the room, he had work to do.

When Matthew left Sarah was left alone with her thoughts. It had gone much better than she had thought, but she had scared herself because she had really enjoyed torturing her brother so much. She was confused about who she really was.

After their little chat on the Saturday morning they never really had a chance to have any quality time with each other. When they did see each other there would be small glances as though they were undressing each other with their eyes. In the back of their minds was the curiosity of what their sibling had in mind for them.

They both did their research on the internet, always being careful to hide any evidence so as not to give each other a clue.

Sarah also found she had to do some shopping; she only missed one item but had to be careful as Matthew's mouth wasn't that big! She didn't want to kill him. She was looking forward to returning back to the Ann Summers shop; maybe that very attractive assistant would be there.

Sarah's shopping trip was going well, that assistant was there and as it was quiet they had a little chat. The assistant's name was Tanya Evans; she was about 5'2", had long blonde hair, a pretty face and a slim body and she appeared to be about 19. Sarah could feel the chemistry between them and this scared her a little, here was another time when Sarah had to question who she really was.

After the small talk Sarah explained what she needed and Tanya helped her with the choice, Sarah was pleased. Sarah didn't really want to leave and made an excuse to carry on the conversation.

"Tanya, this is a little embarrassing but do you remember the outfit I bought before?"

Sarah was sure Tanya blushed before replying, "Yes, I remember, it really suited you."

"Can you wear underwear with that outfit, I'm not sure if you can?" Sarah asked while looking to see if Tanya was blushing.

Tanya replied but she couldn't look at Sarah's face, "You can but only if it a skimpy pair of knickers. I have just the ones for you, special stock."

This underwear really was special stock and Sarah bought them straight away, she was shocked when Tanya asked her if she wanted to try them on first and if Sarah needed an opinion all she had to do was ask her. Sarah was so shocked that she didn't take her up on the offer, Tanya seemed disappointed.

Now it was time to leave but before Sarah left the shop she told Tanya that anytime she wanted to go out for a drink all she had to do was to call her. Sarah gave her the number and Tanya was maybe a little too quick to give Sarah her number fumbling to find pen and paper.

When the two had swapped numbers Sarah left but not before Tanya wished her well on her special night. Sarah had just made a new friend, they had got on really well and it would be interesting to see just how close they could be.

Back in the shop Tanya locked the door, went to the bathroom and splashed water over her face while trying to get her breath back.

Sarah's shopping was now complete and she had the complete outfit. She was happy and decided to take a nap when she got home, all the time wondering what Matthew had in store for her.

Matthew had already decided on his show stopping act but continued to do some 'research' anyway. He didn't worry too much about clothes; they wouldn't be on him for long.

They both slept very well that night, each of them with their own thoughts and dreams. Matthew had Sarah in all sort of positions, while Sarah was thinking about taking Matthew by surprise and she was sure Tanya was in her there as well.

The Sunday saw a nervy atmosphere between the two of them, each of them impatient to start and they got more frustrated as the day progressed. They had arranged the time for the big night when they had breakfast but not too many words were spoken otherwise. The only other major highlight was Sarah's request that they both eat lots of pineapple or other sweet fruits; apparently it had a pleasant after effect and she wanted to see if it was true.

Throughout the day the most they could do was eye each other up, each with a glint in their eye. Neither could wait for 8 o'clock to come around and so they had to control themselves somehow, amazingly they did.

The magical hour soon approached and Matthew and Sarah started to get ready for their special night. Around an hour before, Sarah had a shower and pampered herself, she needed a little bit more time as she had to try and see if she could squeeze herself in to her costume and wear knickers at the same time.

Matthew did not need too much time to prepare as all he needed was to have a shower and get changed in to a pair of shorts and t-shirt. Clothes were not the most important thing on his mind.

Sarah took control of the situation and she approached Matthew's room to speak with him. She knocked and entered as his door was already open.

Matthew was waiting to see what she had to say but in the meantime all he could do was ogle her body wrapped by a solitary towel.

"Bruv, at eight o'clock go to the front room and wait for me there. When I knock on the door close your eyes and only open them when I tell you to. Otherwise I will cancel the whole thing."

Sarah was laughing, especially at the last remark as she knew her brother would do nothing to sabotage this night.

Matthew agreed and Sarah left the room, when she entered her bedroom she closed the door and locked it afterwards. It was best to take no chances.

The time approached and he went down to the front room, he sat down on the sofa and waited for Sarah to arrive, with just his perverted ideas for company. He did not have long to wait until he heard his sister's voice telling him to keep close his eyes and keep them closed. He did as he was told and when he was allowed to open them, his eyes almost popped out of his head.

Sarah stood there dressed in a tight black leather outfit he had never seen before or could not have imagined existed. Whoever designed the thing was really kinky. He took some time to appreciate Sarah in her outfit taking in the low cut, showing off her cleavage perfectly. It was obvious she was not wearing a bra and that her nipples were standing to attention.

The outfit clung to her body so much that Matthew could make out the outline of her knickers, he was a little disappointed she was going to wear knickers but he would soon change his mind on that.

The most striking thing about the outfit was the zip that ran from one side of her right breast going down diagonally to the top of her left thigh. Unzipping that thing would be like opening presents at Christmas.

Matthew felt guilty now, he felt a little too casual especially as his sister had made such an effort for him. He hoped his sister wouldn't mind that he didn't make the same effort that she had.

He didn't have to worry; she was only interested in the contents of those shorts, which was now very erect.

Sarah moved over to Matthew and sat next to him, she wasn't totally comfortable as her outfit was a little restricting. It didn't matter as the effect had worked and it wouldn't be on her for long anyway.

She whispered in his ear, "Do you want to see me get out of this thing?"

Matthew just nodded.

Sarah stood back up in front of him and slowly reached for the zip. She decided to tease him a little and take it slowly. She wasn't sure if her tease would work or not, but her instinct told her that nothing was going to stop Matthew enjoying himself whatever happened next.

Slowly she pulled the zipper down sensing that her breasts were fighting to be free; she paused for a few seconds before she knew her right breast would become free. She continued to unzip and her breast popped out all red and sweaty with her erect nipple on show, she continued to unzip and the other breast popped out, just as red, sweaty and erect. She only stopped when she got as far as her stomach.

"Do you want to see the rest?" Sarah asked with a smile.

"Of course I do, don't ask stupid questions."

"Well then bruv, why don't you finish off the job and see what else you can find? Do it nice and slow."

Sarah moved closer so he could finish unzipping her. Her crotch was at the same level as his head, if she was naked she knew what her next move would have been.

She was aching to get out of the thing and it would be a great relief. The costume looked great and it turned her on, her pussy was soaking. Unfortunately it was uncomfortable to wear and it made her all hot and sweaty, besides she couldn't wait to spring her next surprise.

Matthew nervously took the zip and unzipped it all the way down. In the meantime Sarah had loosened the top half so now her upper body was free of the outfit. Her flat stomach, breasts and back were red and sweaty. Matthew didn't notice he was too busy working on her bottom half.

Sarah had knickers on which intrigued him, only when he saw what knickers she had on did he understand why she had worn them. He had caught a glimpse of a zip on the middle part of her knickers, he didn't expect that. He couldn't see all of her underwear properly but knew he would have to investigate them more closely.

When Matthew had finished unzipping her costume and she had given him some time to work up an appetite, Sarah told him to help her and push the bottom part down so she could get out of the costume altogether.

When she was out of it he now understood just how special those knickers were. It appeared that the zip was attached to all of the material and when it was undone the top and bottom half would separate, allowing easy access to Sarah's pussy. He liked this surprise.

Sarah bit her lip in anticipation of what she knew would happen next.