Cousin walks in on brother and sister

[Brandnewbuddy]

So…I think I’m gonna actually write this one. I have the initial idea but I’m not sure where I’m going to stretch it to afterwards.

So our lead is in college and, not having a job, her parents make her move in with her cousins. While she doesn’t hate them, she’s always getting compared to them as they skipped grades and graduated college really early and even have high-paying jobs and their own house despite being in their early 20s while she struggles with school and has no idea what she wants to do with her life.

So she moves in and things seem to go well: her cousins are far from sticks in the mud and are okay with her partying and having a social life as long as she takes precautions and goes to school.

Though there are some odd things she notices: cousins sleep in different rooms but Jake, her male cousin, has a lot of stuff in Sasha’s, her female cousin, room while his room is pretty bare. Ryan also has receipts for a lot of condoms but he never seems to go out with anyone.

So one night when our lead comes home early, she notices a light on in the kitchen and sees Jake plowing his sister on the counter. They keep fucking, oblivious to her watching until she makes a sound.

So after everyone calms down: the siblings explain. After getting their cousin to understand that no, they weren’t abused as kids, nor are either of them forcing the other into it they talk her that While they have done well for themselves, they’ve never really been able to bond with anyone their own age. In school their classmates were always older and in college anyone who was interested in them was suspicious as hell so they stayed to themselves, and their coworkers also either see them as oddities or are uncomfortably interested in them. After they got their house, they started becoming intimate, initially through mutual masturbation and then through sex. While they aren’t romantically in love, it’s a part of their life that they couldn’t imagine going without.

So the next part I figured was that cousin offers to set them up with some dates, so they can break out of their taboo habit. Cousins agree though are a bit reluctant. So cousin makes an offer: if she can’t get them dates in a week, they can go back to fucking each other and she won’t stand in the way.

Cousin then spends time with each of them and secretly becomes turned on by their tales of debauchery…and secretly wants to get involved too.

But I wasn’t sure where to take the story. Or if I should take it down a different path:

The end goal I want is that cousin winds up having sex with both of them but whether that’s all or not is what I’m not sure of.

Another path I thought of is that the siblings agree to try someone else, but ask cousin to be their initial date (cousin fucking being legal where they live and she looks different enough from them no one would question it).

Cousin agrees and soon finds herself enamored with her cousins but still try’s to get them into some normal relationships.

 

[sirhugs]

one teist would be to gave the cousin offer to go along on double dates. Cousin is jealous that the dates get lucky each night.

The third night, all six go dancing. That leads to the incestuous threesome.

 

[LupusDei]

I had one start with somewhat similar setup, from the brother's angle, but might as well work from the Sister's best. In that case the relationship between siblings was not yet matured to full out sex when she arrives, and the cousin becomes the obstacle and the catalist simultaneously.

Brother and Sister live together (and the description as given above may fit rather well). Brother has long standing crush after his a bit older sister, and they have always been very close emotionally. He might have engineered the situation with them living together for a purpose, and not really interested in anyone else, she is unable to really engage with anyone outside. But all he's got to so far with her is, he's more or less successfully nudged her into home nudism thanks to their new place, and enjoying that a little too much secretly, while she acts as if clueless and sisterly even if probably confused and conflicted knowing silently, but unlikely planning the grand seduction of her little brother just yet, still hesitating.

Just about when Brother thinks they're approaching breakthrough to the next level of intimacy and finally turn their relationship sexual (he may or not be delusional on that), the cousin arrives.

I imagine the Cousin at least Sister's age or little older and she may still see the Brother as, if not a kid, someone younger than her crowd, at least at first (it might work the other way, with older Brother and Cousin the youngest, in rather natural way, but with some added creepiness moment if Brother remains the active protagonist).

She herself had a very sheltered teenage years in very prudish conservative family, but gone out wild starting college, wild by her parents assessment. Actually she's just discovered her bubbly outgoing self and mostly just experimenting, but it's been enough of a disruption to her previously preordered life, and set off all kinds of problems leading her now to this, somewhat forced on everyone, but simultaneously convenience move in over to the independent prodigy siblings.

She's running from her family and seeking independence, her parents hope the cousins would serve as a role model and get her back on worthy life goals, out of fucking around. The Sister cousin doesn't mind, the Brother nobody asked for reall, and he has little formal reason to object, as it makes tons of practical sense for the Cousin, and is of little inconvenience for them, apart from running afoul his special interests, but he can't assert those.

The Sister of course tames down her own recently very leisurely behavior at home, for a great upset for Brother, but growing accustomed with the Cousin living with them gradually go back to the newly acquired habits, like nude sunbathing out in the garden and sharing showers with brother, but not quite that nonchalantly as before, hiding both ways for the benefit of Cousin's feelings. Cousin see it, and is at first shocked, by each little infraction of her strict upbringing, but simultaneously willing to dismiss that, open her mind and enjoy herself, for short, she join in some of the clothes optional aspects and grow more intimate with the Sister day by day, and may be interested to experiment with her, in what she sees as safe environment.

It may or may not be true, but Brother in his jealousy think Cousin is all out for seduction of Sister and obviously is succeeding, and while wish them all the best, he wants in on the action. Knowing for fact Cousin is at least bisexual if not rather straight and just playing, he decides his way back to his sister goes through seduction of the Cousin, he may have never dreamed about such a threesome, but a guy has to live with what he got, and the Cousin isn't unlikable, not in the slightest.

The Cousin meanwhile sees more and more signs she interpret as full sexual relationship between siblings, some of the situations she walk in on are so out there it's natural to assume, even though not actually true yet, and she is not interested in confronting it too directly (out of practical fear to be thrown out among other reasoning), but very intrigued nevertheless.

The sister does of course notice Brother developing interest in the Cousin, and is naturally jealous, and it may make the final perspective shift of him as a sexually eligible man.

For a while, probably rather short, everyone think the other two have sex, while nobody does but the tension grow.

Then, the title becomes true, the siblings fuck and the Cousin walk in on them. It might or not be their first time actually. The other combinations follow shortly.

For a long term happy end Brother and Cousin marriage may become front for the permanent threesome. (Maybe first cousins are legal at the locale, maybe they're a bit further away, but their families being traditional large extended family networks are maintained.)

 

[Brandnewbuddy]

I like both those takes.

Sirhugs: I could see that idea playing out really well. Maybe they hit the club and the jealously starts turning up once they hit the dance floor. Depending how double dates are arranged it could lead to some interesting combinations:

For example if cousin is going as bro’s date she suddenly notices him becoming frustrated. Looking over, she sees that sis’s partner is getting handsier and cousin seems to be really liking it. Cousin then tells him to use her however he wants to work out his feelings…brother obliges till he is straight up fingering her on the floor. Sis then comes over and while bro tries to deny he got jealous, sis admits she was trying to toss herself at her date so bro would feel like he could also cut loose. However her aggressive approach actually scared her date off (she was guiding his hands on her body)..Cousin who is hot and bothered and knows bro is in the same boat, tells them to call the evening a wash: they’ll go home, “get it out of their system” and try again another night.

Or if everyone has a date, cousin has to keep going between all of them and their dates, trying to make things work out, especially when one of the siblings’ dates leave.


Lupusdei: I really like the idea of the cousin being the catalyst that pushes things over the edge into taboo sex. It could make the situation a lot more dramatic with tensions running high in the home before during and after cousin discovers them. Bro seems more manipulative in that version but I could see that giving the story some delightful sleaze.

Like the night where they finally have sex, bro actually becomes even more interested in having sex with sis once she tells him she never fucked their cousin. because he wants to have her before cousin gets a chance. It also could could make cousin gain an antagonistic role to bro that she first uses to try and lord over him once she walks in on them, perhaps even using the incident as a way to finally seal the deal with sis (“well if you can fuck tour brother you should be okay fucking me”) and maybe lead up to her first fuck with bro being a cathartic hate fuck before they finally resolve into a threesome.

 

[LupusDei]

Lupusdei: I really like the idea of the cousin being the catalyst that pushes things over the edge into taboo sex. It could make the situation a lot more dramatic with tensions running high in the home before during and after cousin discovers them. Bro seems more manipulative in that version but I could see that giving the story some delightful sleaze.

I don't know if that would tame or exacerbate the sleazy aspect, perhaps depending on how the development of the situation is presented (ETA: say, if it's just an independent effect on Sister, or even if Sister choose the place in hidden pre-existing desire to go that way), but a voyeur Brother may as well be completely content with just passive perving on his newly baked nudisty Sister, the arrival of Cousin destroy his existing idyll, then elevating the relationships to sexual becomes fight for regaining that.

And yes, that would warrant a hate fuck of the Cousin, one she might already seek and certainly enjoy

 

[Brandnewbuddy]

I think that is a good dynamic and could give cousin a different kind of motivation: maybe she realizes what brother was doing before she got there and decides to mess with him…while also trying to “make a man” out of him.

Like this is different than the ideas we both had but what if cousin is playing both of the siblings and slowly entangling everyone into the taboo threesome while playing innocent? Like oiling her cousin up and rubbing her mound when she knows bro is watching and pressing her tits up against bro or grinding against him while sis is watching.

So by the time the siblings fuck, she’s had them both jealous as well as sexually frustrated from her teasing. Then when she walks in on them, she lets bro finish and then leads sis away to eat her out, but not before calling brother pathetic for only watching for so long and (once sis is out of earshot) saying sis must have only had sex with him as a pity fuck…so she’ll make sure sis is really taken care of tonight.

So she goes to sis, calms her down and then eats bro’s cream pie out of her, making a show of wiggling her butt at the door where bro is watching, teasing him until he storms in, yanks her panties down and fucks her hard as she keeps eating his sister out.

One hate fuck later and bro is shocked at his action but cousin comes clean as she entices sis to join her in making things up to brother and beginning a three way relationship.

 

[LupusDei]

what if cousin is playing both of the siblings and slowly entangling everyone into the taboo threesome while playing innocent?

For sorta random comment, a traditional couple has one relationship to worry about, and that may be complex as fuck; a fully formed threesome has not two or three, but seven relationships to manage:

A+B
A+C
B+C
A+(BC)
B+(AC)
C+(AB)
A+B+C

 

[sirhugs]

For sorta random comment, a traditional couple has one relationship to worry about, and that may be complex as fuck; a fully formed threesome has not two or three, but seven relationships to manage:

A+B
A+C
B+C
A+(BC)
B+(AC)
C+(AB)
A+B+C

is the twist that they are all math nerds?

 

[LupusDei]

is the twist that they are all math nerds?

Cousin is probably into cooking or anthropology or phonetic analysis of Shakespeare sonets through prism of post-feminism sociology, but the Bro at least might be indeed all out math, since his early independent wealth comes from some digital economics almost certainly.

 

[Hypoxia]

For simplicity, bisexual cousin Pat takes twin cousins Larry and Mary skinny-dipping in hot tub and does them both. Cue the triad daisychains.

 

[sirhugs]

For simplicity, bisexual cousin Pat takes twin cousins Larry and Mary skinny-dipping in hot tub and does them both. Cue the triad daisychains.

bisexual or non-binary?

 

[Anthonysdaughter]

At a family reunion, a brother and sister look for a secluded spot to enjoy a little sex together. Finding what they believe to be an empty room they strip down to have sex on top of clothes that are lying on the made-up bed. Unknown to them their cousins, a second brother and sister pair, are watching them through the slats of the closet door. (They are naked, having quickly hidden in the closet when the second pair of siblings opened the bedroom door.)

Then two of the parents of the four siblings / cousins enter the darkened bedroom and the second set of cousins who are now also naked quickly hide in the now very crowded closet. The two parents, who are a third brother and sister pairing, have sex on the bed on top of their (adult) children's clothing while unknown to them the four kids watch them.

When the oldsters are done they leave. But they tidy up the room and take the kids clothes with them. Stepping out of the closet the four naked siblings / cousins must figure out what to do. They can't go back downstairs naked...

For extra credit the kids are double first cousins, and the two parents who were left alone downstairs-- who are brother and sister-- sneak out to fuck in a chaise lounge beside the swimming pool while their spouses are upstairs...

 

[LupusDei]

When the oldsters are done they leave. But they tidy up the room and take the kids clothes with them. Stepping out of the closet the four naked siblings / cousins must figure out what to do. They can't go back downstairs naked...

For extra credit the kids are double first cousins, and the two parents who were left alone downstairs-- who are brother and sister-- sneak out to fuck in a chaise lounge beside the swimming pool while their spouses are upstairs...

...and the four youngsters decide they may as well try to sneak out to the pool for a quick skinny dipping together before going to find clothes to put on. Yes, it's risky, but there's already a certain subconscious will of being caught by their parents. As they rush out on the pool deck, they don't readily notice the other couple of parents slowly fucking on the chaise lounge.

They are seen by them, but in the heat of passion they have left their clothes by the door and now have nowhere to hide, and they are overrun by the four naked adult children jumping into the pool and soon seen by them too. It's quite a shock, but everyone's laughing even if in embarrassment.

Meanwhile the first set of sibling parents are figured out just what clothes they have grabbed with discarded their's tidying up that room. They now do know those are the clothes the youth had on shortly before, and there's apparently a full set. The conclusions are already... intriguing. Then they hear the laughter and squeals by the pool. Did they all change into swimsuits? But together and in that empty room? And nope, a look outside confirm everyone at the pool is naked.

On the pool deck there's quite an amazement when they see the remaining two walk out the door naked as they all are. They may comment on another set of clothes that need tidying up, but unlikely detour to do just that right away, but the implications that this is now suddenly accepted house attire is clear, and they all remain nude for the remainder of the day.

Does that become traditional for their family reunions? With probably four different colleges for kids and who knows what work arrangements for parents those may be under treat to become increasingly rare. Or with work from home becoming lasting norm and clever planning, may they figure how to all move in together?

 

[Anthonysdaughter]

...and the four youngsters decide they may as well try to sneak out to the pool for a quick skinny dip...

I like where you ran with that, Lupus.

 

[PattieD]

Doesn't anybody lock their door when they choose to get horizontal?

 

[Carnevil9]

Doesn't anybody lock their door when they choose to get horizontal?

What fun is that?

 

[LupusDei]

Doesn't anybody lock their door when they choose to get horizontal?

Not all indoor doors are lockable. Room doors having locks in residential housing is almost unheard of around here, and when they happen to do the actual keys are usually stored elsewhere if not long lost.

 

[PattieD]

Not all indoor doors are lockable. Room doors having locks in residential housing is almost unheard of around here, and when they happen to do the actual keys are usually stored elsewhere if not long lost.

Oh geez
Interior door locks DO exist
Just not on this page or this site
Every interior room door in my house has one of those turn lock door thingies
. . . that doesn’t mean that they all work
Actually, none of them did until my dad replaced both of the locks on the bathroom doors
Whereas
I put a deadbolt on the door leading to the basement where my bedroom and bathroom are

 

[DCO_65]

Doesn't anybody lock their door when they choose to get horizontal?

The old Victorian house I grew up in was already about 70 years old when I was born. Not one of the interior doors had a lock on their cast iron latch plates. Through decades of the house's gentle settling, and the door's slight warping, none of the door plates lined up with any of the jamb plates anymore.

That didn't really matter because those doors that closed were held shut because the seven foot tall, eight panel oak doors (that weighed 100 pounds apiece or so) were out of square with the eight-and-a-half foot tall hand carved oak frames (with opening glass transoms). So doors were either impossible to close or very difficult (at least for a child) to open.

They also provided potential voyeurs with nice usable spaces between door and frame.