Boyfriend wants threesome with my sister, should I?

Me and my boyfriend were discussing sexual fantasies a couple of days ago, and with a little persuasion he opened up and said he always wanted to have a threesome. At first I was angry that he wanted sex with someone else, was I not enough?
Then I started thinking about two men, two hard cocks to play with, a night of being really slutty. Then I realised he only meant two girls.
I decided to ask him about his fantasy, did he want us to pick up a girl together, or did he have someone in mind. After a while he finally admitted is ideal threesome would be with me and my sister. Woah, he fancies music sister I thought, wtf, no way is that ok.
So can I ask, who thinks that this is a normal fantasy? Is sisters a common fantasy? Does anyone think I should do it? (Assuming my sister would say yes) please help

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  • Actually my first fmf 3-some was with twin sisters at 16 and it was there idea. And I had a fmf 3-some with my wife and her sister, my sister in law suggested it. But you have to consider how your sister might react at the suggestion. Maybe if you do ask her kind of joke about it first then if she freaks you can say it was just a joke and make her look like crazy for thinking you'd do something like that.

    But from what you said about being hot about the idea of 2 guys at once I'd make that part of the deal. If you think your sister will freak I'd look for another girl. Maybe a friend who'd do it if your bf finds another guy and her get a mfm 3-some too.

  • I think an mfm 3s is more risk to our relationship than FMF, as he can be quite protective but I'm pretty laid back. With my sister the thought was to go for impromptu by messing about with her in front of my bf and see how far she goes in spur of the moment. I think more likely to work, but does not allow for ground rules or preconditions, so not without risk.

  • I feel like your Boyfriend. I think my Sis in Law is jealous of her Sister ( my Wife ) and years ago she flirted with me. Anyway, during dirty talk with my wife I sometimes bring up her Sis.. I say things like " I want her to watch you sucking my Cock" "Would you like that" Sometimes she doesn't respond.. which means NO. But other times she goes along and says "Yeah, I want her to watch" One time I told her I wanted to see her Sis sucking her Tits and licking her Pussy.. She even said " Oh yeah, she could lick it good" So, doubt it would ever happen, but I think about.

  • My sister was visiting again yesterday, and due to careless tidying she found out one of the sexual role plays my boyfriend wants. I had left my old school uniform on the bed, which I had been trying on after finding out it was another of my bfs fantasies. She came up to borrow some clothes, and quizzed me about why it was out. She straight away knew why I had it out, as I struggle to convincingly lie to her.
    She told me that she still fits her old uniform too, and admitted wearing it for fancy dress and getting a lot of male attention.
    She suggested we should both get together and get a photo of us in our uniforms recreating an old picture.
    The original wasn't a selfie, so I said someone would have to take it, my sister suggested my bf, which gave me an idea.
    Does anyone think my bf would like to come home and find two school girls in his bedroom?
    I thought I could ask him to take the photo, then ask him to take more and start fooling about with my sister and see how far I can take it, I might be able to turn it in to an impromptu threesome?

  • It's a good plan.. I'm thinking your BF would go along.. in a New York Minute. I would love to be there too... :)

  • Are you in to school girls or sisters? What would make it perfect? (I really want to hear male opinions please)

  • Last night when my sister had had a few drinks we got talking about sex and I asked her if she would ever have a threesome, she said she would as she thought it would feel naughty and therefore sexy. I also asked her about two men or a man and a woman, to my surprise she said with another woman. I joked about her being bi sexual, and she said it was more pleasing two men would be hard work, and it would be easier with another woman and just one guy. She then admitted to being a lesbian for 2 weeks when we were at school. She realised it was just a phase, but thinks she could have sex with a girl she just prefers men.
    Research done I think. I didn't ask about the specific situation, as I am still really worried about my bf and her given some of the negative responses.

  • I did this with/for my husband. My sister was on board as soon as I asked, which in hindsight should have been a red flag. It was for his birthday, all about him , we didn't play or touch each other except while we both sucked him at the same time. He fucked her, he fucked me then she went down on him and sucked him until he came in her mouth, she swallowed which is something I don't do which my husband pointed out ,saying to me " oh fuck babe she is taking it all right down, why don't you ever do that." Well that pissed me off so his birthday fun was over, but it didn't end for them. I found out a few months later that they were fucking behind my back. We divorced and they actually started dating. Be very careful it could break up your whole family .

  • Thanks for the advice clearly risky

  • You should just swallow it then. By rejecting his cum in essence you rejected him..

  • I dated a woman for years , eventually living together. She was pretty open when it came to sex so when I brought up wanting to have a threesome she asked with another guy or girl because she didn't think she could handle me fucking another girl. I told her I didn't care and if she wanted it to be with another guy fine. She told me she would think about it. A month later she brought it up and told me she would do it but only with someone she could absolutely trust not to tell anyone. I ask if she had someone in mind and was a little shocked when she said she was thinking she would ask her brother . It was a little awkward at the start but seeing her sucking her own brother's cock and him fucking her was pretty intense. I asked her later if she and he had ever messed around before , she denied it but the way they interacted once things got rolling make me thing they had fucked before.

  • Sounds like they had been at it for years and have now got it out in the open

  • No siblings, you get mfm first, then see if he’s still in to it. I guarantee he just wants to fuck your sister.

  • I don't think you should. At least not with your sister. Are you bi? If not, scratch the idea of bringing in another girl too. It can be too much of a mess if you are getting nothing out of it, and you are sitting there watching your bf fuck someone else's pussy. It will be a bad vibe. You might not like how much he will enjoy it--and want more of her. Or how much she will like your bf.

    Sounds like you are okay with two guys. I'd talk that through with him. I'm way older and have been married for years, but I have MFM threesomes with my husband and a good friend of his maybe 4-5 times a year. That works for us, but bringing in another woman would not.

    Find your common ground. It will take honesty and communication.

  • I'm not bi, but did experiment at school so know that area. You are right how would I feel if he was using it as an excuse to fuck my sister while I watch. And I might worry about an affair. Saying that I trust my sister and could insist on no penitration of my sister??

  • IF my wife had a sister I'd want a threesome with them.

  • So is is specifically a sister thing? Is that hotter than a friend or stranger?

  • Who wouldn't

  • It is a normal fantasy and very common. If you and your sister are ok with it i don't see a problem, are you the jealous type? and do trust your sister?

  • Hell yeah, let him do you and your sister. I did this with my girlfriend, it was totally hot. Watching two sisters go down on each other while they took turns sucking and fucking my cock was the greatest thing I have ever done, ever. Of course she insisted on being double teamed by my brother and me, which was also pretty hot.

  • Not sure I could go down on my sister!!!

  • Why not?

  • Ok confession time I have fingered my sister, but when we were young. Curiosity about boobs and hair led to curiosity about masterbation, and eventually orgasms, but that was a long time ago, we are older now. I couldn't imagine being naked with her let alone pleasuring her with my tongue

  • Thats sexy ;)

  • Ha ha, must be a man, turned on by the idea of two young sisters exploring their bodies together?

  • It is a normal fantasy, but do not do it with your sister. Also insist you do a MMF version for you.

  • Interesting bargaining tool, MMF for MFF hahaha

  • ^THIS^

  • Yes. Plus a thrtsome with you and your mom too.

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