Author's note: this story was originally published on Literotica with a different ending. The new ending is substantially similar, but I never liked how the original ending was written. As a result, some of the comments on the story no longer make sense. I mainly write these stories for myself, and I want to be able to read the updated version here.
When money got tight, the family had to move to a smaller house. The twins, Liam and Emma, were in their final year at school, having turned 18 earlier that year. Exams were coming up, and they didn't need any more stress at home.
When the parents found a house within their budget, they broke the news to their kids: it had only one bedroom for the two of them.
"You two will be moving out of home soon, we should imagine, to go off to university," their mother explained.
The twins weren't happy about the turn of events. Surely a teenage boy and girl need separate bedrooms!
Nevertheless, before long, the family were unpacking their stuff in the new house.
"It sure is cosy," Liam intoned.
"I like it," their mum said. "It's a bit like the one we had back in Liverpool," she said to her husband, who was just carrying a big cardboard box in over the threshold.
"Before interest rates took it off us," he replied. "Not our first rodeo," he said to the twins, handing the box to Liam.
The twins went to their room together. There were two single beds, one for each.
"It could be worse," Emma said. "We could be in the same bed."
Liam, already over six foot tall, cast a grim expression at the bed nearest the door. "Not sure that would be worse." He dropped the cardboard box on the floor next to the bed. There was barely floorspace for it. "We're right on top of each other in here," he said.
Once he was done unpacking his things, Liam went to jump in the shower. The house had one bathroom for the whole family to share, across the hallway from the twins' room.
Sauntering back to the room with his towel wrapped around his waist, he found Emma still unpacking things and putting them in appropriate places around her side of the room.
Liam cleared his throat. "Erm, do you mind if I get changed in here?"
Emma glanced over at him, her gaze flicking back and forth between his face and the towel around his waist. Trying not to blush, she coolly said, "Oh, sure."
Liam could feel the heat in his face as he unwrapped the towel around his waist. His teenage genitals felt awfully exposed with his sister just standing there.
Of course, it wasn't the first time she'd seen him naked. Siblings should be able to be naked around each other, surely. Nevertheless, it was an awkward reveal. Part of him wanted her just to get a good look so it could all be over with.
Clearing his throat, "I guess you've not seen me naked since we were little kids," he said, hanging the towel up on the side of the cupboard.
She glanced over again. There it was, her brother's penis, dangling, uncut, unshaved, right before her eyes. Her gaze lingered on it for only a moment. She quickly turned back to what she was doing, "No," she said, "I guess not."
That night, before bed, Emma took a shower of her own, and came back to the bedroom wrapped in a towel.
Liam was already under his duvet, reading a book.
She cleared her throat and dropped the towel.
Liam glanced over and took a wandering look at her body for the longest four seconds of Emma's life, all without a word, to her great relief, then quickly found his book very interesting again.
She pulled some panties and a t-shirt out of the drawers in the cupboard, pulled them on and got into bed. The ordeal was over. The twins had seen each other's private parts and nothing bad had happened.
"Sleep tight, Liam," Emma said, rolling away from him.
"Sleep tight, Emma."
One evening, Liam got home from school and Emma was on her bed, studying. There was no desk space in the house, apart from in the kitchen. She had always preferred to study on her bed anyway.
After he showered, he went into the room and collapsed naked on his bed. "Emma," he said, "would you mind if I just lay here naked for a while? I'm exhausted."
She didn't want to come across enthusiastic about it. "Oh," she said, "sure. I don't mind."
When Liam closed his eyes, she took the opportunity to perv a little. She quite liked the look of his flaccid penis there, just out, just lying over his leg.
Getting a good look for the first time in her life, she decided she liked how it looked. Her brother's penis was handsome, or maybe handsome wasn't quite the right word. Either way, peeking gave her a delicious feeling. He would never know she'd done it.
One evening, later that week, Emma found herself "bottomless", wearing only a bra, rummaging through the drawers in the bedroom cupboard, looking for a specific pair of panties.
Suddenly she became aware that, bent over like this, she was pointing her asshole and pussy directly at her brother, who was studying for exams on his bed. She turned to see if he was peeking.
He was in the middle of reading a photocopy of something or other - not one of her subjects - which had flopped back over his legs. Seeing her eyes on him he flicked it back up and stared hard at it, avoiding her gaze, going red in the face.
He had been peeking, the big perv! How would he like it if she perved at him? Of course, she had already perved at him, the other day when he was lying on the bed naked, so maybe she couldn't really judge. Fair enough, maybe she'd cut him some slack, but she sure wasn't going to feel bad about ogling his bits when he wasn't looking.
Now that she thought of it, did she really mind if he took a peek at her pussy and asshole every now and again? It didn't fail to occur to her that, were she that way inclined, she could bend over and point her pussy and asshole at him like this every day if she wanted. He would never know if she was doing it deliberately.
Soon enough the twins got used to seeing each other's bits more than usual. There was only one problem: Liam seemed to be semi-hard a lot of the time, whenever he was naked. Sometimes he would go about with a full-blown erection. Emma could hardly help herself in those circumstances. One evening, she was in the bath when he walked into the bathroom.
He said something she didn't hear.
"What's that?" she said.
Raising herself from the water, she was greeted with the sight of his tumescent penis inches from her face.
"How long are you going to be in?" he said. "Just deciding whether to put my sweaty clothes back on."
It took her a while to process what he'd said. She realised she was staring at his hard-on, and looked quickly up at his face. He didn't seem to have noticed.
"Yes," she replied. "I was just about to get out. You stay like that. Stay right here if you'd like," and she pulled the plug.
Being exams period, both Liam and Emma had reduced contact hours, meaning they were often home at the same time while their parents were at work.
When they were at home, the twins were supposed to be studying. Unfortunately, with the tight household budget, they didn't get a lot of entertainment. Unbeknownst to each other, they both spent a lot of their time masturbating.
They also spent a lot of time on the couch watching TV. Occasionally Liam would get hard and Emma would surreptitiously take a look at his boner through his track pants. Even more occasionally Liam would notice a tiny wet spot between Emma's legs. He never said anything, though it was often all he'd think about when he was jacking off.
Liam would often touch his bits through his track pants in front of his sister. At first, he did so absentmindedly, and stopped when he caught himself doing it. Before long, however, he caught his sister watching out of the corner of his eye. Encouraged, he started touching himself deliberately, playing with his dick, or touching himself while he was naked, seeing what she would let him get away with. She never said anything.
Instead, she started going about the house more and more wearing only a t-shirt. The t-shirt seemed to get shorter and shorter, and she seemed always to be bending over in front of him, or sitting with her legs spread, exposing her pretty pink vulva to his view.
Liam and Emma were both virgins. They were both adults, to be sure, but they were both horny teenagers too, and inexperienced with naked bodies their own age. As much as they maintained a disinterested facade, they both appreciated having a model of the other sex at hand.
Emma sometimes got self-conscious. A single "weird pussy" or "weird butt" comment coming back to her from their friends would be devastating. Of course, realistically, she knew that any such comment from Liam would make him the pervert in their friends' eyes; and Liam, meanwhile, understood that it was not in his interest to jeopardise the privileged position he was in (seeing his sister's boobs and butt and pussy every day).
All told, an unspoken peaceful agreement arose between the twins rather more easily than either had expected. They would do their best to be discreet, and if either caught the other showing off, or getting an eyeful, they would both deny it.
As far as anyone knew, they were completely normal teenagers: they lived with their parents, hung out with their friends, went to school and studied for exams. In reality, they were completely normal teenagers in the other sense, i.e. horny sex perverts.
Before long, the fateful day arrived when the parents would be leaving the house for the weekend, to see friends in Warwickshire. They'd be leaving Saturday morning, staying overnight and returning Sunday.
"Now," their dad said over dinner the Friday night, "I don't want any messy house parties. If you're going to have friends over, make sure to clean up before we're back."
The twins glanced at each other across the table, exchanging a quick but meaningful look.
That night, after showering, Liam went into the bedroom to find his sister naked on the bed, playing on her phone. When she saw him, she jumped up and walked over to join him at the wardrobe.
Side by side, going through drawers and cupboards, they chatted with each other, both completely naked, both a little hard (nipples and penis, respectively).
Something had changed between them, even if neither were conscious of it. For the first time in the months they had been living in the new house, they felt genuinely comfortable with each other naked.
The following morning, Emma was the first to wake. The parents were already gone. She looked at Liam lying peacefully in his bed. There, in the back of her mind, lascivious thoughts lingered, unacknowledged, yearning to be spoken out loud.
If they were comfortable naked with each other, she reasoned, it shouldn't be a problem for her to be naked with her brother all day, with the parents out of the house.
She walked naked from the bedroom to the bathroom, the feeling of nudity delicious. It felt like a rebellious act, as though she would walk naked before her brother in defiance. Defying him to look, to see.
As she showered, the water running over her body, she imagined how Liam would react to her simply being naked in the house. Would he join her? They could be naked together. The parents would never know.
Walking back into the room, wrapped in her towel, she saw Liam had woken. "Good morning," she said, and gave her body one more rub dry with the towel.
"Morning," he replied.
Beyond that, they said nothing to each other as Liam slowly but surely unwound himself from his bedsheets and rose, and walked, just as naked as she had, to the bathroom.
Emma made her way to the kitchen, still naked. Now! That felt
really
rebellious. She had gone without panties in the common areas of the house before, but never actually naked. She made coffee for herself, completely in the buff.
Before long Liam emerged from the bathroom and, seeing she wasn't in the bedroom, called out to her down the corridor. "I was thinking," he started.
