I've always been hypersensitive to any sort of power differential in relationships, so this type of dynamic would probably have me on edge. Actually, it depends on how it's presented. Usually, the harder a writer tries to convince me that there's nothing untoward going on, the more ooked out I am. Weird, maybe, but that's the pattern I've noticed.

Fortunately I find that power differentials are more common in het than femslash.