Here is a "fantasy" I've shared with my man a few times. Since we live in a rural gravel road type of area it could someday happen. We have an outdoor four-person swing sitting between our house, the road, and our driveway. Happy reading.
I would have him accept his collar before anything else is to happen. After he says "Yes," I snap his collar around his neck. He is then told to remove all items of clothing and present himself all clean and fresh to me by laying over the edge of our bed with his legs and hands spread out.
I will be filling his enema bag up as full as I can get it, about three quarts, while he is getting ready. I would return to the bedroom to make sure he had cleaned his rectum. I would then insert his balloon enema nozzle into his ass. I would blow the balloon up to keep it in place.
I would then lead him out to the swing in our yard. He would sit as comfortably as he could on his side of the swing. I would place the wrist cuffs on him and attach them to his collar on his neck. I would attach his ankle cuffs to each side of my swing seat. I would hang his enema bag in a hole in the frame so he could watch it as it emptied into him.
After setting myself on my side of the swing, I would crack open the valve on his bag. My feet would more than likely be placed to massage his cock while he is being filled. He would be sitting out there in our front yard exposed to any vehicle that may go by on our road. He would be sitting there exposed to anyone driving into our drive. He would be unable to run into the house or even be able to cover himself without my releasing him from his cuffs.
We would just sit there swinging while his belly is being filled. He would be required to sit there until I released him from his cuffs, then he would have to walk back into the house to the bathroom to release the pressure that was created.
Maybe sometime this summer I can report back how well this scenario played out.