would really love to hear how I can acomplish this...we flirt constantly, just not sure if anyone has an idea on how to do this? All my fantasies have involved her for the last 20 years...

Yeah, dude, what Mmonroe said. You're better off not doing it.

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Go check out my new story - How Did This Happen? - John's Story

like my mother always said 'Don't shit where you eat'

I almost envy you, man. Most the women I've known in my life and kept around for any length of time, either didn't have a sister, or had some that I never could get excited about.

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The best thing you can do for your fellow,
next to rousing his conscience, is - not to give him things
to think about, but to wake things up that are in him...
to make him think things for himself - George MacDonald

Talk about High Risk Sex!!!

Not only are you putting your marriage in jeopardy, but also the relationship of your wife and her sister.

If you get caught with another woman, you wife may get passed it, but with her sister that memory will be thrown in her face a every family get to together

There must be another place to fulfill his need.

Of course if you must go down this trail. Ask you wife and ask you sister in law.

From a woman with years of experince in an open marriage.

If your wife is that vanilla, then it's best to remember that some fantasies are best left, just that.

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The best thing you can do for your fellow,
next to rousing his conscience, is - not to give him things
to think about, but to wake things up that are in him...
to make him think things for himself - George MacDonald

My wife is a great lady and loves sex....as long as it's strait forward me pleasing her. She is just not open to any adult content on tv or any type of porn, she is vary standoffish about performing oral sex both giving and receiving, so thats my lot in life. My sister in law loves sex and is the exact opposite when it comes to adult content, I am sure thats why she is my fantasy...lots of love making with my wife, unfortunaly I am usually miles away in my mind pleasing her sister....

Perhaps if you give half as much attention to the pleasure of your wife, as you do in your mind to her sister, she wouldn't be so vanilla. There are moments before the release of a woman that she will do anything for the finality of it all... play with those moments... since she likes sex, you will get to practice over and over. Shouldn't this be in the Relationship Advice Section? LOL.

I know exactly what you mean, I’m totally in love with my sis in law, but unlike your wife, mine has a crap sex drive, and as for vanilla I wish she was that even.
I love her, she doesn’t know, and that's the best way.
Dont rock the boat,, you'll only fall out !!

Sounds like there is the Good Conscience on one shoulder whispering in your ear...and the Evil Conscience whispering in your other ear.

FUCK HER!

Guess which one I am....and that's what you get for advice on a site like this with me lurking in the weeds

Asking the advice of sexually liberated people - case in point - could get your arse kicked soundly - LOL ...although I have read a few of the responses that seem logical enough to your dilema. I thought of offering advice, but seeing that even I consider myself a complete slut, I thought it prudent to have a mug of "shut-the-fuck-up" and save you the pain and anguish that would be dished out should you even consider this "suicidal" objective.

The inevitable problem will arise time and time again... your sister-in-law you cannot avoid and the flirting will continue. Unless you or the sister-in-law has the will power of steel, the flirting will continue to be dangerous and even more exciting.

The only time this obsession with dangerous flirting will stop, is when one of you starts to deflect the sexual and flirty advances.

As if you haven't brought up this very fantasy countless times...

Also spinninjenny's suggestion about fucking the mom first is genius! Might want to toss a spanking the grandma's way just for good measure as well...

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Triplets!??? SHIT!!!! It's bad enough having Loislane as my 'Wifey'. chefkathleen as my 'Hot Monkey Lover'. What the HELL am I gonna do with you? I guess I will just have to ask ya by request to become my friend for now. Later we can find a place for ya.
And I thought hallbrn had troubles with just a sister in law. I find out here I have sisters that are Triplets.

QFT ^!

You say she doesn't have any inclinations towards oral sex betwixt (is this the right word here? I dunno lol...sounds good though) the two of you; but yet you say there is 'lots of love making' going on. Seems to me that you both enjoy sex. She may be vanilla but, you did marry her and not her sister. Maybe a slow and easy building up of bringing up certain desires of yours (not the extramarital ones lol) while you both are laying with each other talking about 'things' could bring her around to some new kinds of 'fun' between the two of you.

Fantasizing is normal and there's nothing wrong with it as long as you keep it in the fantasy realm...especially when you know (as it seems you have already stated) that it would most likely cause problems. Man, seriously...I'm willing to bet that she has some fantasies going on as well, especially since you mentioned that you both enjoy sex :). It just may be that she is more of a shy type when it comes to verbalizing intimate and sexual thoughts to you.

Are you happy in your marriage in most other aspects? If so, why mess with a good thing? In asking that, basically I'm saying; if ya did do 'the do' with the sis-in-law (just to appease some fantasy longings you both may have with each other), do ya think, in the long run, that it would be worth it considering the consequences?