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i believe okayu is suffering what often happens to sexual assault victims where they cannot cope with their inaction and inability to defend themselves during the encounter. its often you see rape victims become uncontrollable sluts or even contact their former rapist as a result of heavy psychological pressure to suppress their feelings of helplessness. the idea is that they convince themselves they were in complete control and they wanted it from the beginning, thats why they will contact the former rapist and try to have another sexual encounter on their own terms. you will also see rape victims or sexual assault victims in general "reclaim" their sexuality by being extremely picky about what they are attracted to as a way of psychologically justifying that they had to have been attracted to their abuser otherwise they wouldnt let it happen.
i believe that okayu originally wasnt a hag chaser but after being groomed and molested multiple times by someone she considered a good friend, korone, she changed her preferences to become attracted to hag idols which is why she routinely rejects shion but practically cums when talking to marine or botan. shes also notorious for her harem collecting ability, no doubt gained in an attempt to reclaim her sexuality by having as many consensual and reaffirming sexual encounters as she could.