Your question suggests to me that you might be thinking there is something wrong with you when you get an erection over your sister. There is nothing wrong with you. Your body is filled with testosterone right now and anything that moves, looks, smells, and sounds like a female is likely to give you an erection.
It's not you - it's your body doing what it's supposed to do. You are NORMAL. You see her as your sister; your body sees her as a female, and to a boy at your age, female means, erection. That's just the way it is.
So stop worrying about it. In fact, the next time you get an erection "Over your sister", say to yourself, "Excellent - I'm normal. And I understand why my body is doing this. I love my sister, but not in that way."
I'd say you have to masturbate on a regular basis. Getting erections like that means that your "pipes are clogged".
you dont kiss at all.
I'm afraid there's no way to stop erections. Erections happen to every man
The valves in the blood vessels which control penis erection quit working with age.
Puberty happened...some girl is turning you on or something. It'll stop only when you stop getting turned on or when you get used to the feelings and learn to control them.
sorry, but the answer is no. erections are perfectly natural
stop taking dope!
Try never. Age and maturity are rarely related.
Ignore entirely the last answer. You don't. You have to wait it off.
Someone might get an erection like ALL I mean ALL the time non-stop erections due to easy blood circulation in the region.
Go to school and get good grades, make something of yourself now and then the attention will be on you later. You don't stop your sister, she is not responsible for the actions of others. You can't control them either. Make your sister your friend and take the above advice.
You get a doctor to check that out because 5 year old boys should not be having erections for 3 days