Neither of us has any surviving family, but we do a lot of socializing with his co-workers. In those circumstances, sitting at his feet and being hand-fed from his plate would be conspicuous and could cause disruptions in the workplace.

However, making sure his glass is ALWAYS full, filling his plate before mine at a buffet, and conducting myself in a manner that reflects well on him and makes him proud -- these things only make me appear a particularly doting and devoted significant other.

His running his hand over day-old welts on my back through my clothes to see me shiver, slipping his hand into the hair at the nape of my neck and giving just a little tug (to observers it looks like a simple caress), growling in my ear "Who do you belong to?" --these things reinforce our dynamic, no matter where we are. And it allows our dynamic without inflicting it on others who would probably rather not know.