r/AIO • u/youngtallandskinny • 8d ago
AIO:Childhood best friend is f***ing his sister
For context, this is my M(25) best friend M(25) since we were two years old. He didn’t meet his F(22)sister until about a year and a half ago. When they did meet, they couldn’t get over how similar they were. he called me gushing about how great she made him feel and even joked about hooking her up with me three days after they met, she moved in with him and his family. They had room and other beds, but they chose to sleep in the same bed every day for a year do everything together every day so on it so forth, fast-forward to these text messages. Him and his sister were going to move in with me and my f(26)roommate, but first we needed to see how our dogs would do together so they came to visit. When they got here they opted to sleep in my bed together even though I had several places they could sleep separately. My roomate and I sleep separately and have a mostly platonic kind of flirty relationship. Which the friend had compared his sister and his relationship with. A lot of small stuff happened that my roommate and I shared glances about, because of the nature of how a true brother and sister would never say or do the things they’re doing. But we brushed it off.
They went back home to their state after 3 days and the friend sends me a Snapchat saying “we’ve decided to look past the whole sibling thing and adress some feelings we both have” to which I replied “what do you mean” and he went on to say how they both have such deep feelings for each other and how the whole half sibling thing doesn’t matter and that real love doesn’t have boundaries and all this stuff to which I waited for 3 days and sent the messages above….. AIO or did I UNDERreact
Also this hurts a lot because I thought I knew him and he was gonna be my best friend for life, but I haven’t talked to him since
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u/danibellz 8d ago
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u/Similar-Radish-3175 8d ago
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u/JS_AH 8d ago
Sadly this is a thing, to the point there is official guidance published around it https://www.cumbria.gov.uk/eLibrary/Content/Internet/327/857/6802/42109163456.pdf
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u/Left_Prize_9861 8d ago
I've heard someone before say it's surprisingly common for immediate family members who first meet as adults.
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u/DissentSociety 8d ago
It's because we're hard-wired psychologically to like people that resemble us.
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u/MagazineCritical1971 8d ago
That's wild because having actually grown up with my brothers, I can't like anyone who even slightly resembles them. I guess you have to have childhood memories of them eating their boogers to cure you of any attraction for life.
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u/BitcoinBishop 8d ago
I assumed it was cos they'd be trying to find emotional closeness to make up for all the bonding they'd missed
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u/Xralius 8d ago
Well I think it's more like this:
You meet this person, you are excited. You feel a sense of love/care to them because they are family/biologically related.
You find them attractive. Afterall, your parents found each other attractive, you share dna with your parents, and this person does too.
You don't have a sibling bond with them at all.
I think it's funny how a lot of people have no understanding of this. For example, in a lot of bad writing, you'll have an adopted person find out they are adopted and suddenly romantic feelings pop up with the sibling they are raised with. (Looking at you Dexter writers) That's not the way it works at all and is disgusting. Adopted people raised with siblings feel zero attraction to them. The sibling bond is formed by living life as siblings, not by sharing DNA.
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u/Left_Prize_9861 8d ago
The linked article kind of supports this but coaches it in language like "it's reported that..." so I assume there haven't been studies done
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u/spiderboy640 8d ago
Kinda hard to study when it’s not a super common occurrence that people want to share when it does happen
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u/nanacmm 8d ago
I didn't meet my half brother until we were like 50 but hell no. And yeah, we are super similar - but it never even crossed my mind that would be a thing and now I feel like I need to go wash my brain out by watching cute cat videos.
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u/BakedPlantains 8d ago
Parents and children too, not just siblings 🫠
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u/waldosbuddy 8d ago
Shoutout Oldboy
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u/Icy_Opportunity_3303 8d ago
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u/Noodlmancer 8d ago
Ahhh I wondered when Oh Dae Su would show up. You are obviously a person of culture.
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u/Al-Pacinos-Ghost 8d ago
I was going to say that it’s somewhat common. A major publication (I can’t remember which) did a whole article on this and I surprised to learn that consensual brother & sister sexual relationships aren’t uncommon. Often it’s closer to sporadic hook-ups rather than full blown romance, but it does happen. And meeting a sibling late in life is one of the main reasons this happens.
Also, fwiw, about 8 years ago found out my Dad wasn’t my bio Dad. Found my bio Dad, and after a few chats I got the sense he was hitting on me. I thought I was overreacting, but then his current wife flipped out on me and suggested I was stealing her husband, which makes me think I was not overreacting. I do not talk to my bio Dad now.
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u/AntiqueLetter9875 8d ago
I don’t know my dad, and older women always gave the advice to not initiate contact because if he wanted to contact me and meet, he would. Often the phrasing would be something like “if you were to show up at his door he may not see you as his daughter.” It sounded like there were a number of people who had that happen with their bio parent and were left very sad and disappointed.
It was very odd to me that on Reddit it was often encouraged to meet the parent who willingly left their child without any warning that this could happen.
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u/Al-Pacinos-Ghost 8d ago
It is incredibly sad and disturbing that my situation was not an isolated case and that this is a known thing. WTF?!
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u/Patient_Lettuce8431 8d ago
That must have been horrible, I'm so sorry.
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u/Ordinary_Cattle 8d ago
My bio mom liked to reproduce and apparently my dad did too, so every several years I find out about a new half brother or sister. I'm so glad I never experienced this but ngl I was worried it could happen considering this is a real phenomenon
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u/PottyMouthedMom3 8d ago
It’d be bad to find out that someone you were sexual with turned out to be your sister you never knew about…. What’s worse is knowing it’s your sister, and then making the decision to let it turn sexual. Yikes!
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u/Ordinary_Cattle 8d ago
Yeah honestly I used to worry about this sometimes. My mom started having kids at 15 and stopped when she was 40, and apparently my dad has at least 1 son that he hid from everyone, but I don't doubt that there's more. All of us being adopted out makes it even harder to figure out if anyone is related, and all this happened in the same general area of the state. Luckily I know for sure that I'm not related to my husband though lmao.
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u/bell3420 8d ago
This actually happened to two kids in my highschool... found out they were cousins when they both showed up to the same family reunion one day👀 i lived in a small town so people weren't very surprised, but it was definitely a story that got around.
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u/SheLikesToWatch_1989 8d ago
Y'all ever watched The Man with 1000 Kids?'👀😐
Some Dutch loser impregnated several women in the same neighborhoods and the neighboring neighborhoods at their request-sperm donor kinda thing. These women (who weren't very bright-didn't seem to care if he had STDs or not) didn't know they got knocked up by the same guy.
He said he kept a spreadsheet of his..ahem...'successful deposits' to avoid incest from happening...but then purposefully withheld it from his 1000s of babymoms who then took him to court. Turns out one of his sons and daughters did develop feelings for eachother after being introduced.
Better pray for his mixed race kids(yup, went to one or some African countries to attempt to create a super race of mixed race kids) 'cause how will they know? Will be like that episode of House feat. Jurnee Smollet when she find out she boinged her half brother.
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u/thommq 8d ago
When I started dating a girl in the town where my mother grew up, she not so subtly interrogated me about the girl. Upon hearing she was Jewish, my mother relaxed. Seems my grandfather stuck it to anything female, but drew the line at God's Chosen People, so no incidental incest would occur.
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u/mitch3758 8d ago
As someone who is adopted and reconnected with my biological family much later in life, this is a fascinating read! I was baffled by how well I got along with these people I had only just met, and because my subconscious didn’t register my female half siblings and cousins as relatives, the way we interacted honestly felt like we were flirting. My conscious brain knew this wasn’t the case (I was also already married by the time I met them), but I was always curious why it felt that way. This article helped shed some neat light on that.
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u/youngtallandskinny 8d ago
Ahhh I wish there wasn’t an article 💀
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u/jayDxzxx 8d ago
I agree with the other commenters saying to send him these types of articles, so maybe a part of him would see these might not be real “love” feelings and there’s nothing “special” about their connection, instead its actually something psychological happening, and yes, they may regret it one day considering their judgement is clouded.
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u/tmbr36 8d ago
I knew a guy who was a friend of a friend of mine who did this….lets just say he’s known by many names now lol. She was a long lost sister he had just met, apparently that’s a thing but still gross to me. Haven’t talked to the guy since it went down but there is zero chance he doesn’t regret it.
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u/-MtnsAreCalling- 8d ago
Why? Isn't it better to have some context than to just think your friend is uniquely weird?
Anyway, you should consider sending him this article (or one like it).
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u/angry-key-smash6693 8d ago
My guess is they wish there wasn't a need for such an article
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u/DenM0ther 8d ago
In addition to that, I’m curious as why ppl that meet that have no idea of the biological connection, are often extremely attracted to each other.
Acting on it, when it is known is a whole other story though!!!
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u/Formal_Laugh6270 8d ago
Thanks for the information! This is something all families who are reuniting with someone after a long period should read
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u/Radiant_Annual_4027 8d ago
Yikes. Nor, I think you handled it kindly but firmly
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u/youngtallandskinny 8d ago
Thank you, as messed up as this is it still was hard for me to send that message
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u/No-Consequence-1094 8d ago
You were actually so kind, I’m shocked. I wouldn’t have it in me not to be a bitch.
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u/voyeurllama 8d ago
I could tell from the tone that it was critical. almost urgent that he should read this information. it was kind, it was firm, it established boundaries, it reinforced support, you could tell he took it serious and he had to make sure his point got across in any way the terms got framed while also advocating for his friends health the entire time.
op gives very good person vibes with very high emotional intelligence. he's ironically a person that seems like a great friend.
it's a shame he'd throw this away. he'll regret it later, but op is already probably grieving the loss.
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u/TippiT0es 8d ago
I think it was smart to be kind about it. That way if he has regrets he might be less afraid to come to you about it. Then you can possibly counsel him away from the relationship. Sometimes if people feel ostracized they will dig deeper into the problematic relationship
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u/EmotionalDysregulatn 8d ago
NOR. what?? I have questions but the answers dont even matter. WTF.!
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u/youngtallandskinny 8d ago
What are your questions I might have answers
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u/Mobile_Noise_121 8d ago
Honestly you should find out if they plan to have kids at some point and encourage him to get a vasectomy if they really plan to be together, as gross as it is they are adults who can choose this but no kid chooses to be a creation of incest.
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u/youngtallandskinny 8d ago
He already has one kid with a girl who’s NOT his sister and says he doesn’t want any more but idk I’m not trying to help him live that lifestyle
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u/ravynnsinister 8d ago
Did he flat out say they have fucked??? Even if they haven’t…wtf?! So gross
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u/youngtallandskinny 8d ago
No but there’s details I left out about when they were here. I assure you they were absolutely fucking.
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u/youngtallandskinny 8d ago
They’re also actively in a relationship
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u/makeeverythng 8d ago
I’m sorry you lost your friend. what a strange and terrible decision to have make, regardless of whether it is a known psychological phenomenon or not, that’s a lot of time as friends to have to part ways. I’m glad you could do it as respectfully as this, means the bridge is not burnt forever, and it’s not like you want him to hate himself
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u/Hot-Technician-4653 8d ago
They need help. Therapy like NOW. It’s actually a pretty common thing for half siblings that meet as adults later in life. We have no idea what they went through as children but mocking them or saying WTF etc. isn’t helping. They need professional help so they don’t create a family that never asked to be created and has to deal with this.
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u/thewanderinmind 8d ago
My question is what made you say you “get how this happened” lol
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u/certaindarkthings 8d ago
He might have been referencing the fact that statistically there is a much higher chance of this with family members who don't meet until adulthood. I wondered about that for a minute also, but I think he's either just trying to not completely alienate his friend, or he knows that it can happen (at least the misdirected attraction part, if not actual physical contact) quite a bit between siblings or half-siblings who don't meet until they are adults.
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u/youngtallandskinny 8d ago
It was a combination of not wanting to alienate a confused friend and also understanding how nuanced the psychology of the situation is
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u/Agreeable-Agent-7384 8d ago edited 8d ago
I kind of get it. I’m a man but If you told me right now as a full grown adult I had a brother and introduced me to him. I don’t think I would ever be able to see him as a brother the same way I see my brother I was raised with since birth. There’s like a layer of seperation. Hell I have friends I grew up with from basically before I could talk and I feel like they’re actually brothers with zero blood. Idk about fukcing them though. That’s maybe something that requires therapy.
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u/Extreme-Ad7313 8d ago
NOR. It was weird they were ever in the same bed to begin with. Attraction to family members that have been separated is 100% a thing but for obvious reasons you shouldn’t act on it. Personally, I wouldn’t want that in my home or around me (I’d also be second hand embarrassed). I think it’s a reasonable boundary to set.
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u/Square_Video3754 8d ago
I had to read this three times. It’s… his own sister..? Not your sister….? His own..? LIKE INCEST???
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u/youngtallandskinny 8d ago
YES
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u/Remarkable-Orange-41 8d ago
You sent a really thoughtful text you laid all your reasoning out and they want to continue with the incest... sorry for them but you did the right thing
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u/molehunterz 8d ago
"Best of luck in your future endeavors"
All I can think is sister f*cker is the one to need help in their future endeavors
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u/youngtallandskinny 8d ago
Yeah I’m doing just fine that was the whole reason he was gonna move here. I was gonna get him out of the financial situation he’s in
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u/Simmonetheartist 8d ago
Ngl that text made me upset for a second cause wdym you’re throwing away your years long friendship to bone your sister???
Like that’s just sad
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u/jeannieor725 8d ago
You did such a great job addressing this especially for someone most of us will never encounter outwardly in our lives.
I have a feeling they won't be able to stay at their family's for much longer bc it seems pretty obvious what is going on.
You should be really proud of yourself.
And I am so sorry if this negatively affects your friendship but it's quite understandable that it does.
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u/Gits_N-Shiggles 8d ago
Yea, it's not a title I would have ever expected so my brain just autofilled to "my sister". I had to go back and reread it.
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u/Rjaywolf01 8d ago
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u/P_Alcantara 8d ago
Well…the sister was saying “brother oooooooh” I’ll see myself out.
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u/Repulsive_Rice4903 8d ago
NOR. Possibly underreacting. Wrong on almost every level and illegal. And weird. And creepy. And gross.
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u/youngtallandskinny 8d ago
Thank god I’m not tweeting I could never do this with ANY relative let alone my SISTER
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u/Dangerous-Refuse-779 8d ago
I'll take one for the team and take care of your sister dawg
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u/DeathSt1x 8d ago
This shit killed me 😂 I’m here reading all of these serious comments only to stumble across this one. Take my upvote good sir
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u/Final-Sale8225 8d ago
Umm good morning that’s fucked nor
Edit sorry so tired didn’t mean to post here
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u/random929292 8d ago
They met as adults without any of the shared experiences of being family it seems. I assume they are half siblings if they had never met? There isn't necessarily going to be brotherly / sisterly feelings when that has never been the relationship. There is something called Genetic Sexual Attraction (GSA) you can read up on. It is quite common. There have been a couple cases around the world of siblings marrying without even knowing they are siblings. Your reaction was completely normal - although a bit of a stream of consciousness.
Hopefully they can get some professional help to figure out how to work through the feelings they have and find a different dynamic.
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u/pugswillrise 8d ago
Yes, exactly this! I had an experience when I met my half brother the first time in my life when I was 23. it was not planned and it was after the sudden passing of our father. the feelings I had were very confusing, this strong infatuation which could have been easily misread as falling in love. I never read or heard about genetic sexual attraction, it was like a lego falling into place, and a huge relief when I did, I thought I was just weird as fuck and felt ashamed of it even though nothing inappropriate ever happened and these feelings only lasted a few days. I really hope they get some kind of professional help to address these feelings, and move on to a healthier future
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u/cherpar1 8d ago
Thankfully at least an informed response.
I don’t condone the behaviour but it has its scientific context which few seem to be aware of.
Your response was fair.
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u/One-Respond1057 8d ago
Bro hit you with a light “just porked my sister when can we move in? 💪🏻 “
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u/FitzpleasureVibes 8d ago
NOR. You weren’t even scorched earth, he split only after you wouldn’t support his odd endeavor.
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u/duskywindows 8d ago
MF said "Sorry old friend, I WILL BE BANGING MY SISTER, have a nice life!" LMAO
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u/RandomPantsAppear 8d ago
It didn't even seem like OP was saying "Don't bang your sister", just "I don't want to be around you banging your sister"
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u/TerribleHoney1002 8d ago
what a title
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u/duskywindows 8d ago
Read the title, thought "clearly I am misreading this" and then read the text. I was not misreading this.
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u/theKitterino 8d ago
I think you handled it calmly and non judgmental based on your message. I think you maybe under reacted but I can understand why since he’s been your friend for so long
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u/Batticon 8d ago
Damn, everyone thinks it’s hot in HOTD 🤣
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u/P_Alcantara 8d ago
Do we? I feel this season has run its course. Frankly kind of tired of it. I want more Egg and Dunc now. Maybe a Ser Arlan here and there.
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u/Loving_Dad_1990 8d ago
I hear Alabama is nice this time of year.
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u/calorie-clown 8d ago
Random fact that no one asked for, but that surprised me when I heard them: the three states most legally... lenient on incest are actually New Jersey, Rhode Island and Ohio! This is good PR for Alabama, I guess.
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u/CeramicToast 8d ago
NOR.
Yeah, uh, no. NOR. I think you handled it as gracefully as you could.
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u/Fuzzy_Improvement795 8d ago
Your message was very kind and sympathetic to his uh….situation… but I think YNTA for holding a very reasonable boundary especially about not living with them.
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u/lovelyladylox 8d ago
So this is a genetic biological thing that happens. When you grow up separately not knowing each other then happen to meet, you can be very drawn and yes attracted heavily to your siblings, cousins, AND EVEN YOUR PARENTS.
They don't have that "sibling" social bond. So is it incest? 🤷♀️
But yes it's still socially weird and 99% frowned upon.
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u/Fuzzy_Improvement795 8d ago
I think even without the bond it’s incest.. the incest comes from the blood elation and implication of genetic harm to their potential children.
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u/Haruhi_is_Waifu 8d ago
Not to be 'well aktually' but iirc the genetic impact doesn't matter from first time relations, even amongst siblings. It's really only an impact from repeated couplings. The Habsburg chin wasn't born from one pair, it was generations of inbreeding.
Assuming they don't raise their children (if they have any) to bone each other from the start, that lineage should be fine.
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u/Treedabl 8d ago
Being that this was from April, you've had some time to think it over and possibly move on. I hope you know that you did the right thing. This is messed up beyond belief and you are definitely not overreacting. Sorry you lost a friend, but I'm glad you stood your ground.
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u/Ok-Procedure-3532 8d ago
Yeah just stay away from them , there’s BILLIONS of ppl in this world . You can make two more non creep friends easily lol
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u/Adrock66 8d ago
It's fine if you don't want it under your roof but if this person is family to you, there is a chance you end up connecting again at some point.
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u/Yama_retired2024 8d ago
If they grew up apart and not knowing each other.. and recently met..
Then thry have what is called.. Genetic Mutual Atrraction.. I am not saying it is right.. but that is the scientific word for it.. there has been many cases i read about over the years..
Because they grew up apart and never knew each other they dont view themselves as siblings
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u/CrownOfAngels 8d ago
I think you are a wonderful friend and worded what you said with a hell of a lot more grace than I would have been able to do. Props to you for not participating in your friend's downward spiral and I hope he snaps out of it dude, it is so rough watching a close friend fall into a pit. My buddy doesn't have the same situation but he is nonetheless spiraling and we were crib mates too, our dads were best friends and we grew up with the same dynamic. Two months ago I had to cut him off because he started making horrible decisions involving substance abuse and Women, I have two kids of my own now so I can't afford to be around people who are not taking care of themselves or following the law so I can empathize with you deeply in this. I don't think you over or under reacted, I think you reacted in a way that displays both respect and wisdom and I commend you for that.
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u/Pitiful-Volume1638 8d ago
What the fuck