Well, you're both about to start puberty if you haven't already. Hormones out of balance can affect people's personality and actions. Tell him to stop if you don't feel comfortable with it.

As someone with a sister I know that even though you know its wrong and you will never act on it seeing the curves of a woman even a sister can turn you on. He is young and will more than likely be just starting puberty and getting horny and these little acts will be about sating his curiosity of the opposite sex. I doubt you will be able to stop him going in your room etc, especially when you are not there and having a snoop at your knickers etc but i would say the play fighting is something that you may have to put a stop to just in case he starts trying to cop a feel.

I doubt any of it will be a deliberate act, but more likely just acting on his impulses. I would say have a talk with him and tell him to stop and not do certain things and if this doesnt work then you may have to have a word with your parents to help put a stop to it. Whilst it isnt dangerous whilst he is 11 i would honestly say that if not put in check it could impact on both of your lives and drive a wedge between you.

puberty. Blame the hormones.


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He's 11 and on the verge of puberty. He's the last one that knows what the hell is going on in his head. He's got close sibling affection for his older sister who he's wickedly close with, which is really very cool, but that affection is getting cross wired with burgeoning hornyness. It's up to you to set the boundaries. Someone, his dad or whoever, needs to give him the puberty talk.

Just try to make him understand!!

As I tell many other people; go back to English class because reading your post gave me eye cancer. Now as for your problem, get a friggin lock. And tell him to f off or you'll kick in the place where he's starting to grow

I'd suggest a lock on your door, as although he will be curious because of puberty, it's not right.
You need to push him away a bit, you don't need a horny pre-pubescent with no idea what changes are happening with his body getting close enough to do things which are inappropriate.