Dominance and submission can be a part of sex or nothing at all to do with it. It's been a mix for me. D/s outside the bedroom has been an integral part of my relationship for my entire relationship, it just works for us. Introducing D/s into the bedroom has been a way for us to explore ourselves and each other.
It's opened doors I never even thought to stand in front of, much less go through. Contemplating a threesome is just one of those doors that D/s has brought me too. It's open and we are standing at that threshold together. I find that awesome and comforting all at the same time.
If we should choose to take a step forward, it will be done together. It is something I would likely do to please him. To fulfill his fantasies, if that's what he really wants. It's not something I ever worry about him forcing me into in any way. That's not what D/s is about for us, it's about freedom.
I've found freedom in D/s, it's a dynamic that feels natural and normal for me. It represents a side of myself that for one reason or another I often suppressed. I no longer have any reason to do that and I'm loving it. Not only do I get to be more authentically me, but so does he. I know he has suppressed some of his naturally dominant inclinations in the past and I know much of that is because of me. He no longer has any reason to do that.
I sometimes find the things he proposes confusing, but confusion in this instance isn't necessarily a bad thing. In this instance it is a catalyst for growth, never a bad thing. I do tend to be an over thinker, and this topic has been no exception. I'm just grateful I have some place to come and work through the confusion.
I have no idea where this fantasy of his will take us, he may not know for sure either. That's okay, it's something we will figure out together to both of our satisfaction. At this point, we are at the very beginning of that road and aren't in any hurry to traverse it. We're going to take our time, maybe some side trips to check out the scenery, or points of interest. The journey really is more fun then the destination and we travel well together.