Interesting idea....could be a way for a "normal" couple to explore their submissive side as the husband is too afraid to talk about his submissive feelings and the wife "has" to in order to save her family ......
on the flip side, a long time ago a neighbor was being audited by the IRS and an agent came door to door looking for the neighbor (They had skipped out and ran from everyone)....I'm not sure who was more tongue tied my hubby or myself as she was gorgeous and super smart. we had a long conversation with her (nothing about her job) but she didn't live in the area
back to the story...
I can see how the BDSM part would work, and that HE can read both their body languages and before the couple knows it, their lives start to change.
challenge, is to keep the guilty feelings to a minimum (keeping the story real)