Wife and I love to go to public sauna centers and nude beaches, as does her sister with her husband.
Only, sister in law never wanted to go together. For some reason she found it awkward for her brother in law to see her naked and vice versa. But funny, cause hundreds of other guys had seen her naked by that time.
Untill several years ago, the 4 of us went on a fall weekend away to the mountains without kids.
We had rented a cabin that included a sauna.
After a full day of hiking, we headed back to the cabin and heated up the sauna.
But because SIL didn't want to be naked in front of me, BIL and I went first and afterwards our wives.
If you've ever been to a sauna, you know that you after to rest afterwards and you still keep on sweating for a while after exiting the sauna.
Because the stove was burning hard, it was pretty warm in the cabin.
Although we only wore a bathrobe, both BIL and I kept on sweating ... so we said to the girls ... you can stay covered up, but we're both going to get naked to cool down further.
Our wives didn't object, so there we were both naked for the 1st time in front of our SIL.
But 10 minutes later, my wife said ... it's also too warm for me and I keep on sweating ... I'm also going to get naked.
She prompty dropped her bathrobe and stood there naked.
I saw her sister's surprised look and a grin on my BIL's face.
The 3 of us stayed naked for the rest of the evening and the same scenario happened the following evening.
SIL refused to go naked and kept wearing a bathrobe.
BUT 2 weeks later, to my utter surprise, my wife announced that she and SIL had booked a day at our local (nude) sauna center for the 4 of us.
Somehow, my wife convinced her sister that it was no big deal that I got to see her naked ... and it was more fun going with the 4 of us.
So at the sauna center, I finally got to see SIL naked. She's a bit more curvy than my wife with DD's and a round butt (vs C's and a smaller butt of my wife).
After that 1st time, we have been naked together lots of times and sauna centers, nude beaches, nude swim events and other weekends away (with and without kids).
Fun fact : after that long weekend were I was naked in front of SIL for the 1st time, my SIL confided to my wife that she didn't expect my dick to be that big and thick.
Of course my wife couldn't keep her mouth shut about that. Have to admit, I did like the appreciation I got from SIL
