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dominateofyou It sounds to me like your instincts are guiding you down the right road.
I don't feel like the balance would be right for you if you were to accept her. I mean, sure multiple doms can control the same submissive - but that requires a lot of communication between all the doms that you don't really have the time to invest into talking... and it takes away from the limited time that you already have to spend guiding your sub.
If he is of the opinion that she is his, those waters are muddied - and it might be worth asking yourself if you really want to invest in breaking down that existing bond or if your time might be better spent looking for a submissive who has already gone through release/abandonment???
At least, with the latter, you are starting from ground zero and building afresh rather than trying to maintain whatever schedules someone else has already trained her to.