How long does it take a talent to get this comfortable being naked around someone else? I can't see any of council doing this.

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Kronii is either self-conscious at first but eases in, or goes hardcore lesbian like in the off collab
Fauna might striptease as a joke but doesn't think much about it
Mumei hesitates from social anxiety and watches the girls undress, likely the type to hide herself in the girl's locker room in high school, but eventually succumbs to the lesbian atmosphere and peer pressure after her horny owl tendencies take over
Bae brazenly strips in order to encourage the others, shocking them with her surprisingly fit physique. Once they start praising her for it she shows a bit more, particularly her abs
Sana does not give a fuck, rips off her clothes and starts molesting everyone
IRyS has no idea whats going on because she's been to an onsen before and thinks its normal, but seeing others go full sexual on each other activates her YabaiRyS, immediately goes for Bae