You raise good points. Yes kidnap scenes present a series of problems. And often they seem to suffer from pointlessness not unlike a Rossini opera where the high point is the overture. What is intriguing with this fantasy does make some sort of sense (at least as fantasies go which is not a very high bar) at every stage

Yes Mistress Good should be a switch or at least once worked as one and can accept being abused by a woman. And yes she is going to lose all her clothes when Mistress Evil captures her. Though it would ruin things in her preliminary sessions if she were even to hint of switching with me.