Dom/Sub forced incest

[only_more_so]

I'm not really into the Dom/Sub stuff or the incest stuff (although I will read both if they look interesting/hot). But I had an idea about 2 doms who are talking and realize that their subs are brother/sister (or maybe a mother and a son, or some other obvious incest paring).

So the two doms decide to test their subs by bringing them together and making them have sex. I don't know if the doms let their subs know that they know the family relationship or not. I could see it going either way.