Platonic(ish) D/s

To me what you describe feels like traditional dating in a bygone era, and is still exercised in some religious cultures. Two people get to know each other without sex. After a period of time, they either get married and 'consumate the union' or part company never having has sexual relations. The dating period is supposedly a time to get to know each other before committing to sex. Of course, many have eschewed that tradition believing that it's a good idea to experience the sexual aspects of relationship as part of knowledge gathering, determining compatibility.

Really though, i don't think you are describing anything new. i know of several here who are monogamous and did not have sexual relations with their mates prior to commitment. i think it's just one of many choices one can make.
Good luck.