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Each Consensual Predator will teach Amelia something, like certain bikinis, by selecting 'Hang Out' while Amelia is with one outside.  Sometimes selecting 'Hang Out' won't result in anything happening, like Neko girl, in which case there's usually some combination of actions to be taken while outside for the Consensual Predator to open up and be more comfortable around Amelia.  Can read a specific Consensual Predator's tip page under 'Help > Predator Tips - Spoilers' for more specific information if you're still lost.