Many writers look for drama to write about when they work with an adult story. What about something ordinary? People who live BDSM lifestyles all the time have to brush their teeth, take the kids to school, feed the dog, make coffee in the morning, do the laundry… all those ordinary things. Take something ordinary and turn it around, make it seem like an adult thing, as if brushing your teeth (for instance) were a fetish, not just good dental habits.
The interesting thing about changing your point of view on something ordinary is how you change the way you write. In order to make it seem less ordinary we add in detail and description. Things we usually do by remote, routine, become important and blown up to be seen as sensual, instead of dull.