object572

I might have a scenario that covers most of your interests. Future timeframe, our characters live aboard a starship of sorts. They aren't the only ones aboard by any means but they've got a uniquely intense sexual tension, due to the unusual circumstances made possible by our setting. In this future humanity has developed the technological means to alter DNA for any reason, hybridize with cybernetics, enhance ourselves chemically, create stimulation through a variety of means impossible today, etc... the definition of "human" has evolved. So have social norms, the nature and means of sexual arousal, the boundaries of behavior in an erotic setting - it's all possible to redefine, to suit an individual or group. It can be bent to extremes. Made to express depraved desires, deepen fixations, alter limits. Safely... or not. Some people intend to enhance these aspects of themselves. Optimizing pleasure or seeking to realize a fantasy, or perhaps it's part of their identity and view it as artistry, aesthetic and fearless self-expression. Others, however... might struggle with all this. Could be a side effect of other modifications they hadn't intended to be sexual in nature. Or maybe, they didn't choose it for themselves. It might not be a physical struggle at all - maybe it's more like being driven to the brink with jealousy, or just... navigating deeply unmet emotional needs in a world that breaks so many rules, offers so many choices? Aliens? They could be out there somewhere. Needing, wanting, to play with those whom they encounter. Who knows, maybe they seek to breed humans for some unknown reason, or reasons plural. Factory farmed pleasure? Could be a mystery that science has to boldly unravel. Hotness can be designed, built to suit, exploited, but not without very human emotional states to contend with.