Guy gives permission to girlfriend to sleep with his sister…before they even meet

[Brandnewbuddy]

Just a funny idea I had.

Couple has been together a while and while boyfriend has met his girlfriend’s family and is well liked by them, he is oddly cagey about her meeting his side of the family.

Girlfriend is puzzled and finally confronts him on this and he admits that he is hesistant because his sister always winds up fucking his girlfriends. The weird thing is, he doesn’t even think she does it out of any maliciousness, she just sees someone she wants and she seduces them.

Girlfriend scoffs and calls his parents saying that she’d love to meet them, and even picks a weekend where his sister won’t be visiting.

However, even with that, boyfriend tells her she has his permission to sleep with his sister.

That weekend sister is there: her trip was cancelled. Girlfriend does see how someone could fall for his sister: she has lived a very interesting life and she is quite attractive but she doesn’t see why her boyfriend is so worried.

So she decides to meet with sister. Alone. In her room. And sure enough, she winds up sleeping with her.

I figured sis also confirms there’s no malicious intent: bro has good taste and she tends to get what she wants and with her lifestyle she sees no harm in taking the opportunities presented to her, even if said opportunities are with women in commited relationships. If anything she’s glad brother gave her permission as she’d rather just have fun and skip assuaging any guilt she might have.

Girlfriend scoffs but then realizes she’s already doing what sis says, like rubbing her feet, letting sis give her a massage, etc

 

[PennyThompson]

I would want convincing evidence of why sis is so irresistible, but I like it, taboo but not quite incest

 

[Rob_Royale]

I think the base idea would work with whatever relation you could think of.
Maybe sis is a super sexy therapist of some sort. Massages are very passe' but it's a popular trope for a reason.

Maybe he just knows his wife well. He knows she's bi and she has a particular type of woman she likes. He knows his sis is the very sort his wife would go for, in a big way.

So he figures he'd just get it out in the open, give his permission for whatever happens, so there's no doubts or guilt.

It's a solid idea, BUT the readers will clamor for it to become a ful incest story.

 

[Carnevil9]

....... BUT the readers will clamor for it to become a full incest story.

Yes, I think many readers will expect it to turn into a threesome. At least by chapter 2.

 

[NuclearFairy]

Yes, I think many readers will expect it to turn into a threesome. At least by chapter 2.

But that doesn't mean it has to. Subverting expectations can be fun.

 

[Five_Inch_Heels]

Does the GF know in advance that Sis is Trans?


Does the GF know in advance that Sis is an extraterrestrial?

 

[Rob_Royale]

But that doesn't mean it has to. Subverting expectations can be fun.

True. I did that with Dreams of Him. It's about a mom who has wild fantasies about her daughters fiance. At the end the expected sex between them never happens though the opportunity was there. Some readers got it and enjoyed the ending but for the most part, it's seen a lot of four star reviews.

 

[Statius]

Funny. Just finished an edit of a story of mine I published here 2 years ago. 'A Game of Pool': Alyssa and Katy'. Alyssa is dating Katys twin brother Aiden, and yes the two of them have sex. Probably take a week or two for the edit to be released, but the original is still available.

 

[Statius]

In part 3 of my series mentioned above also 2 yrs old the 3 of them do have sex, but no incest as nuclearfairy says above

 

[GlennJenko]

Just a funny idea I had.

Love it.

My only change would be that he doesn't outright give permission (though I know that somewhat defeats the purpose of the thread title). I'm more into the cheating kink that sharing/swinging, so I wonder if there's some way for the girlfriend to misconstrue (at least to begin with) her boyfriend's word on how comfortable he is with the girlfriend and sister getting closer and that then leading to the inevitable outcome.

It could also be much too cliche, but I wonder if there's a possibility that gf and sis have already met. Maybe at a bar/club, sis tried hitting on her but gf pulls the old "I have a boyfriend" card so sis backs off... until gf thinks she has her bf's permission so is more amenable to it.

Maybe sis is a super sexy therapist of some sort.

I really like this. What if sis is a standard therapist/psychologist and offers gf a small, informal session after seeing how stressed and on edge she is? Maybe that's where gf can get across that she thinks she has her bf's permission to sleep with his sister - the main cause of her anxiety.

So she decides to meet with sister. Alone. In her room. And sure enough, she winds up sleeping with her.

This does seem much too fast, though. Have it be an extended weekend, with the first night/following morning having the "session", followed by flirting and some light touching (while dancing?) the next night in view of the bf where he doesn't seem to mind - reinforcing the notion of him being okay in both women's minds - and then the final night has gf in sis' room and that's where they take things all the way.