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Mmmm it's an interesting idea! Though... I don't think we'd be able to act as naturally as we do with a sister around. It'd be awkward, you know? "Hey, nii-chan, have you seen my bra?" Women things like that would be soo torturing! Awful!
Anyway, at least the sister is usually as unattractive as we are, haha! (Not in a bad way, a good way!)
