This story looks to be set in a time where they have reached a comfortable domesticity with each other. They've gotten past the stage of discovery and have already gone through whatever angst might have happened along the way to accepting each other's bodies. So yes, this skips any plot and goes straight to the porn. But, it still lets on that there was probably a story behind it and doesn't do something like "What? You have a penis? Oh well, let's fuck." Quality porn with plot will likely always be rare, even more so for certain fetishes. If you really want a good story exploring realistic problems, you're off to a good start, but you'll have to do a lot more talking to get someone with the right abilities to notice. To anyone who might have said abilities, I hope you might find inspiration to do something like this.