I think this counts as consensual depending on what he does going forward, For example, if he then makes her explain what she hoped to have happen while under hypnosis and she explains she fantasized about being like the helpless hypnotized subjects in the hypnotic eroge, then I feel it could still be considered consensual.
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Search for other doujin sites with Google and then search for "My Dress Up Darling" and "Hypnosis" or something on those sites.
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