"Our" D/s relationships are no different from any other romantic, vanilla or otherwise, relationships.

They are hottest when new and you grow them from there. The newness wears off but the passion morphs if you let it... if you help it.

If you can't keep a bdsm relationship hot and alive, you are going to fail miserably with a vanilla one too. So, imo, no worries, because I suspect one has, if not the both of you, weg, a great imagination.