Make sure you've established that the relationship with your gf is open, or at least open to introducing a 3rd party to play with. Talk to her about her sexual fantasies, see if she's interested in a threesome. If so, try to game the sister away from the gf until you've established something of a connection. Then dual-induction massage that shit and do tell us how it went. I've never got 2 sisters before but it sounds HOT.

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This is so insane that I just had to reply!

This is beyond insane, it is hilarious!

So you are basically trying to cheat on your GF with her sister... That I have never done... But I guess I wouldnt resist the temptation if I had the chance either. It is so out there that it might even be worth it.

If you arent concerned with your GFs feelings of course.

And breaking up two sisters who should love each other (in a non sexual way)... (unless I am involved... ).

And that your GF will no doubt find out and dump you.

Not giving any advice here, just keep us posted, I really wanna see how this one will end.

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bbardot: you just reminded me about porn

Guys, thanks for your comments and ideas.

By the way I talked open with my GF about threesomes quite often, she is not interested because she is not bi, especially with her sister. I asked about this too
Of course she is against my idea f****ng her sister, but at least we talked about it.

The interesting thing is that her sisters game is hard to understand from my perspective: On one hand she sometimes talk dirty about me (my butt, my p***, me coming over to her house, me cuming) on the other hand she refuses any escalation from my side and blocks every conversation I started concerning sexual themes.
Is her dirty talk just nonsense to compensate for something or how would you interpret this strange behaviour?
How can I override the "Don't f****" my sisters brain BF block?

It seems to me the main issue here is that your girlfriend is not satisfying your needs. Why would she not say anything with her sister spanking you on the butt? I don't understand the weird relationship. Sounds like something out of a bad soap opera. Her sister is what we call a cock tease. Naturally most girlfriends do not want you fucking their younger sister. If you really want to fuck her sister though, you should be willing to lose your girlfriend forever. Otherwise, please hold onto your girlfriend. You said it yourself, she doesn't want a threesome, especially not with her sister.

-Chicoman

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Come on guys! I thought PUA is about seduction and not about ethics.
Any seduction related hints from you?

Yes it is, "for with great powers comes a great responsibility". There is a rule: "leave her always better than you found her".

But there are 3 things a guy should do in his life before he dies:

1) fuck an older woman ( at least 10 years older)
2) seduce and fuck a stripper without paying her
3) fuck your girlfriend's hot sister/ your boss's daughter

Although it might go against my morals, it would be epic if you would succeed in it .

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I did 1) (she was five years older and had a great body), 2) is on my list, but I need 3) to happen soon...

Shyler, what do you believe: Would a girl refuse to f**** her sisters boyfriend because she risks her family live or would she take the risk because she loves risk and challenges? How important is it for a girl to get what her older sister has (her boyfriend)?

Well, it depens on the girl mostly. In general, it's socialy not acceptable to fuck your sister's boyfriend. And no matter how much the sister might want to fuck you, this will always play their parts.
If the sister will have sex with you, she risk her family ties to be destroyed.
So basicly, your game and the sexual tension must be stronger than her values to that. And only you can judge how big that is. If needed you should also convince her (subtle, non-verbally, indirectly,...) that those social rules are not relevant and that they're there to be broken.

From earlier posts, she seemed to me like a horny hot girl. It is difficult but not impossible. You might not hear many stories about guys fucking their girlfriend's sister (at least I don't), but sisters flirting (heavily) with and liking their sister's boyfriend is not uncommon.
You have heard of girls fucking their best friend's boyfriend or vice versa? Well, I guess it is kind of the same.

But you should play the game right. Basicly find a time and place where you are "accidentaly" or "coincidentally" alone together. Like coming at your sister's house, while knowing that there is noone there except her sister, say "hey is your sister there? ... oh ok. Btw I'm thirsty I would like to drink something before I go". Or go to the sister's house and say "hey I wanted to buy a present for my girlfriend and I wanted advice from you" or whatever you like. Then hang out with the sister and make your move.

Only you can know if the sister is willing because only you can feel the situation. Keep also in mind that if you use your move on the sister and she rejects you, that she might tell your girlfriend. And then it's fucked up.

Succes man!

_________________
You WANT to make a change.
You CAN make a change.
You WILL make a change.

Ambitious to be succesfull => Shyler

they are in on it together, its a trap! they r crazy, run!!!

did i hear you right about you talking to your girl about banging her sister??

that was a mistake, now she knows you are at least thinking about it!

they are going to find out, you know they talk about you all the time, i dont know why they would share u..

i dont know man, i usually just find a time where girlfriend is busy and not going to call or text then tell the other girl "sis in your case" hey im available between this and this time. if u wana do this dont be late. its probly only going to be a one time thing. i have heard of this before from a friend, but it was lose the girlfriend, pick up the sister. maybe fight- break up -bone sis -get back together is your best bet..? in that order

does your girlfriend have access to your computer? dig through your phone?

Update: My girlfriend is away for the weekend. Her sister called me (she knows that her sister is away)... a little chat about what I am having for dinner, what I am doing... and that I should call her sometimes soon...

How would you proceed in this situation? I would clearly believe this is an IOI

Of course I would ask any "normal" girl to have a drink or lunch together (classic date situatation). But how to proceed with my girlfriends sister?

Your gf's sister calling you and being friendly with you and even making lewd comments or patting your ass doesn't constitute IOIs necessarily. Bear in mind, this is not some random stranger you've met in a bar. You're dating her sister, so the way she perceives you is probably permanently altered by that fact. Maybe your gf's sister doesn't mean anything by it, or maybe she does fancy you and likes the excitement of flirting with you (due to the taboo factor, since you're dating her sister); but she'd never act on it because her sister's happiness is more important to her.

Besides, some women just like to make outrageously flirty / overtly sexual remarks just for the shock factor. One of my great aunts was like that, she was an elderly widower and an eccentric person to boot. I remember her openly making remarks about men's "packages," wolf-whistling from her balcony at cute men walking by on the street and talking about the sizes of cocks of various male animal species when in the company of other family members. My mother, especially, used to blush bright beetroot red at her stunts, and my aunt would find her discomfort hilarious.
Not surprising she's against the idea. I assume you were positioning the 3some as the two sisters having sex with you simultaneously (and not engaging each other sexually, since that would be incest), it's still a repulsive thought for most self-respecting people. To put this in perspective, ask how you would feel if the positions were reversed and she was asking you if your brother could join you two in bed because she fancies him.
It's not so hard to understand once you put yourself in her shoes: If you had a brother and your brother had a hot gf whom you fancied, would you act on your feelings and sleep with her knowing it would mean deeply hurting your brother and creating an unrepairable rift between you two? Any stable human being would choose never to act on their crush in order not to betray their sibling (whom they presumably love more deeply than their interest of bedding members of the opposite sex)...

It's a woman!

This made my day!