Yes that is normal dont worry about it

HAHAHAHAHAHAHA ITS NOT RIGHT BEING TURNED ON BY YOUR SISTER, YOU FUCKEN WEIRDO

U should have f*cked her silly, so later on in life u could always Blackmail her if u really needed too.

me and my sis did something like that once. except i was only 8 and she was 12.

That's a little weird..

Would it still be normal if it happened more than once?

to be fair its not really normal at all but if its just once its easy to forget about more than once. your pretty much fucked up.

Yes. Perfectly normal. In fact, it is so normal I suggest you tell your parents what you both got up to immediately. They will be ever so proud of you.

Frouned upon, but understandable.

my sister was kinda like that.altho we never did anything she did once see my penis and since it is rather large she would try to get "accidental" looks at it after that.She would also tell her girlfriends about it.I was tempted to show it to some of them but knew Id be labeled a pervert if caught so I never did.but i think alot of siblings have similiar stuff when they are younger .only when it continues into adulthood is it a problem.

Depends how young u were...I mean some kids are curious ... but since were able to cum, I'm assuming you were at least 12 yrs old..which is a little fucked up since ur past the age of "experimenting" but ... as long as it was an accident and as long as it was mutual, I dont think any harm was done.

wow