It's probably nothing (unless later you stumble upon pictures of them spanking each other nude or something).
For the girl in the pictures, her sister (your friend) is probably the person she is most comfortable around posing seductively in a bikini. It isn't as awkward as parents, she can presume her sister isn't going to have lots of dirty thoughts like a male friend, and she is probably much closer than a female friend.
Is it normal she had a bunch of pics of her sister in a bikini?
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It's probably nothing (unless later you stumble upon pictures of them spanking each other nude or something).
For the girl in the pictures, her sister (your friend) is probably the person she is most comfortable around posing seductively in a bikini. It isn't as awkward as parents, she can presume her sister isn't going to have lots of dirty thoughts like a male friend, and she is probably much closer than a female friend.