Only have one BIL...he's my sister's husbands, so there's certainly no desire to trade on my side, lol. Not sure about his side. Closest thing I can think of is my college girlfriend and her sister. I got to know her sister's husband (then boyfriend) pretty well. Definitely wouldn't have had the guts to propose trading the sister's together at the time. Both sisters were hot, but I didn't know the guy nearly well enough...plus I didn't have this fetish yet.

But vicariously, I still enjoy your story! Sounds awesome to watch your wife and her sis prance around naked in front of you and your BIL.

Great to compare sisters
 

I have pics of my ex and her twin sister. Oh and come to think of it their mum (total milf). And current wife and her sister. I love the comparison side of things haha

Wow! I take it you mean nudes?

How did you get the pics of your ex's twin sister...and their mom...and your wife's sister? Did you do a bit of personal computer exploration? lol

The ex’s twin and mum was both very quick Bluetooth sending while phones were unattended!! Was such a rush I could feel my heart beating out of my chest

And my SIL while high and chatting to my BIL, disclosed they had a swingers account online. Didn’t take a lot of searching to find them haha

Sounds like you're implying this isn't believable? It sounds plenty feasible to me. For many years lots of cells didn't even have passcodes/lock features. For example, when I was about 17 I worked a summer job at deli owned by a husband and wife. One time, the husband accidentally left his phone at work. My coworker found it, looked through the pictures, and quickly found tons of dirty pics of the wife. He didn't tell me about it until a week later....the bastard!

True
 

You don’t have to believe me. And to be honest I couldn’t give a fuck if u do or don’t. As to where to look…a gallery is a good start…. This was over 12 years ago so Bluetooth was the quickest way to transfer. As I said believe me or not I couldn’t give 2 fucks

Having a Hot tub helps out in this case!
 

With the Adult type signs we have Posted at our pool and Hot tub, those over start off by laughing it off as mostly a Joke for "No Suits are required". But no matter if we start out with suits on, most of the time we end up all NUDE and like always the help of a few drinks makes it easier to Break the ICE!
I find that as long as you have at least one willing and playful woman to go along, the others will join in for many reasons or just wanting to be out done or a wall flower that nobody pays attention too!
Women being the show offs they are, enjoy showing a weight loss or just how huge their boobs are too!
That's why is mostly turns into a comparison situation in the Hot tub with one wife at a time showing off and talking another one into doing the same thing!~
The other side of that is things never stay only one sided, so the wife's have Us guys stand up and I'll be the first one to say that with thrilling moments like this going on I do get a bit excited and show off my ever growing bobber! lol
So now from just being in a playful state with these invited exposed guest in the Hot tub, my wife along with some of the other wife's get playful hands or fingers and enjoy plenty of touching that makes thing Hard now! lol
But for as the size of that Top portion, my mother-in-law is the largest / going next would be my sister Kelly / followed by our daughter / then my wife near the bottom of the list! lol
Having a pool and / or a hot tub / and a Boat is always on the top of my list for ways to enjoy a Naughty life! lol
:D

I've seen the MIL topless a few times, as well as some older topless sunbathing pictures in some family albums. She's small, and isn't shy and has changed in front of me a few times. Seen her nude only once or twice. Her breasts are much smaller, and she's very slim, was fairly attractive back in her day. Also she doesn't often wear a bra, and there are lots of peaks, but I don't find her attractive and she is very casual about it.

I slept with 2 sisters. The one with the better figure in clothes looked less good naked. The sister had bigger nipples and more of a waist than the hotter clothed one. Similar skin. You could tell they were sisters. The less hot one also had the warmer pussy.