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Definitely not the chuubas that try to have a chaste veneer. They'd probably be holding back as much as possible. Pekora is loud but that doesn't translate to the other type of loud.
Probably a hag (Lui, Mio, Botan) or someone who's really self conscious about some sexual aspect about themselves (Suisei, Rushia). Towa would be a good contender for number one.