Not all of our fantasies will see the light of day. There are just some desires we have that are just very difficult to execute on any normal occasion or would require such liberal attitudes from lovers we know we’ll rarely, if ever, see them come to pass; plus, it would require us to act so selfish that we’d run the risk our lover never accommodating us again. Not all fetishes and kinks are equal and some will simply be too repellant for our significant other or even a casual fuck buddy to see to fruition.

Some things are just better left either unsaid or tried with only the most trained mistress or master specifically outfitted for that kink.

But if we are lucky enough to find a playmate who might indeed like a kink or two and we theirs, someone who doesn’t find our needs too extreme or upsetting, than it really becomes a, beggers-can’t-be-choosers state of affairs.
A threesome in kink doesn’t not always work though.

Two doms do not double a sub’s pleasure, as much as two bottoms to spank doesn’t not making the spanking more intense for the one dom.

First of all, for any kink play to work best both participants needs to trust one another implicitly. Such trust is hard to grow between two people, throw another person into the mix, even someone interviewed for the possibility, the delicate balance the couple enjoys and thrives on can be rent asunder.

Secondly, the specific attraction to BDSM play or any sex play really, is the attention a dom gives the sun and how the sub surrenders, in affect exchanges power and will with and through the dom during the course of the play; with a third person involved the sub will have to split their ability to exchange this very nebulous intimacy.
Lastly, a fetish scene is often developed around the physical proximity and maneuvering of people in a play space, add another person into that space and the maneuvering has to change.

Unless a couple sets aside a specific play time to include more than just themselves, unless a witness to the scenario is actually part of the kink, unless all the mathematical contingencies our considered, the kinksters might do well simply playing with other partners by themselves at other times.