For those that have asked what happened after the last chapter, here is a summary. There is no sex, and if you haven't read at least Chapter 8 this post makes very little sense. It also gives away the surprise ending of the Series so please read the previous chapters before perusing this.
A year later
All four of us have settled into domestic bliss. Sally had twin girls; I have a little boy. All three are just three months old, both Sally and I apparently got pregnant on the joint Hawaii honeymoon.
The new house that Hank bought, just did not work for a family of three so Master gratefully made room for all of us in his house with a small addition. We have a nursery for the three babies, and Sally and I treat all three as our own and help each other with parent duties including lots of diapers. My son looks like Hank, the two girls look like Sally which Sir said is a good thing.
To keep things straight I call Hank Master and the man I called Master Sir. Sally does the opposite, though in practice we obey both as our Master, and both are free to use or discipline either one of us as their own. I sleep in Master's bed most of the time, but nights in Sir's bed are very common. Both Master and Sir refer to Sally and I as sisters, and in a real sense we are, incestuous sisters, and we share a lot beyond our two Masters. With three babies, we nap together whenever we get a chance, and both Masters encourage us to enjoy each other and frankly Sally is better and more enthusiastic with her tongue than Master.
My sister and I are always naked, cuffed, collared, plugged, and in heels in the house. Outside the house, such as when I go to the office in town, it is short dresses, heels, and unobtrusive collars. Bras and panties are not allowed, thigh highs or suspender hose when the occasion requires it. It is a rare day that I am outside the house without a plug in my ass, and often with an egg vibrating in my cunt.
I swear our two Master's are telepathic, there is never any confusion or conflict between them, and we never hear them have a discussion. As I said, most of the time I spend the night in Master's bed but when I spend it in Sir's there is never a discussion that I hear or am involved in. The same is true when my sister and I wind up in bed together with either Master or Sir. As far as my sister and are concerned we do what either one tells us, knowing that the decision has already been made and agreed to by both Masters.