Does anyone have experience with sex between families of two brothers or two sisters?

[Penelope]

That is, there are two brothers and they both have families. Or two sisters who have families.
And these two families of brothers or sisters, let’s say, first became family friends, and then after some incident they agreed to have sex with each other.
I wonder how this happened and how in the end We finally agreed.
And how it is happening now. How tenacious is such a tandem and how long can such a relationship last?

Again, what about children? Whether they know about all this or not.
Again, are there cross-children? Well, it’s kind of unclear from whom this or that sister got pregnant - from her husband or from her sister’s husband.
Well, in general, this topic is interesting. What and how.

[niqk]

Yes, an interesting twist! Did you have something similar:?

[Hair shirt]

Yes, an interesting twist! Did you have something similar:?

Written here - Re: Sex with an older woman (Post by Anonymous #22820)

[Flex]

It’s unlikely that there are such people; usually sex with close relatives is kept secret from everyone, and rightly so. In incest there is a third wheel, although of course there are exceptions