Those studies you linked to are concerned with CHILD SEXUAL ABUSE, something that childhood experimentation is not considered part of.
OP, its only considered abuse if she clearly exploited and coerced you into it, if she used her power difference over you to get what she wanted. From what you wrote, this could possibly be the case, but only you know that for sure. Inviting her friends to join in sounds like a pretty big red flag but I don't know all the circumstances.
There's also a chance it was really just normal childhood exploration, which is extremely common among siblings. If it felt playful and non-aggressive then chances are it was totally fine, and you freaking out about it in your head is actually messing your mind up worse than the incidents themselves.
A therapist will tell you the same thing.
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