That sounds good.
The problem I have (and I stress this is a personal view) is that BDSM is often portrayed as someone getting off on either the power or the submission. That can be part of the romance, but power/submission is more of a head game thing.
This is true, to a degree.
The most important thing to emphasize is trust. Trust is absolutely vital in D/s relationships. The submissive places a lot in his or her dominant's hands and without trust that just can't work.
D/s relationships are most definitely not about some cruel person trying up some helpless stranger, having his or her way with them and getting off on that.
It's important that the OP stay well clear of stereotypes. Submissives are not all spindly old men in powerful jobs who pay Miss Whiplash $500 an hour to hurt them. Submissives massively outnumber dominants and their numbers most definitely skew female.
Secretary is a good place to start, because above all else it portrays the relationship as positive and something that makes the submissive happier than she is without it.