Some people are more sexually advanced then others. At thirteen it is definitely normal, she is exploring her body and finding pleasure in it. By the way it sounds you might want to ask her about it, you might learn somethings. Another observation if I may. You imply that you are uncomfortable with your sister masturbating but after the first time you still walked in without knocking. There is no such thing as a accident. Once is an accident, Twice is intent.
Is it normal for a 13 year old to masterbate?
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Some people are more sexually advanced then others. At thirteen it is definitely normal, she is exploring her body and finding pleasure in it. By the way it sounds you might want to ask her about it, you might learn somethings. Another observation if I may. You imply that you are uncomfortable with your sister masturbating but after the first time you still walked in without knocking. There is no such thing as a accident. Once is an accident, Twice is intent.