why is it creepy?
Your right. It's totally normal. Let us know how your mom likes it too when you find out. Nothing wrong with that either.
yes I am very protective of her
Well in that case...maybe just ask her? I'm an only child, so I have no idea what it is like to have a brother. If you are very protective, then I am assuming that you two are close? It may be okay to just ask her then. Or ask her in a subtle way, like "at what age do you think it is appropriate to become sexually active?"
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no I am protective
Hmm there is a saying. Do not undertake anything that you wouldn't ask support from the heavens for. There are personal boundaries and such. Just imagine what would happen if your sister even catches you asking this question. Now multiply that a thousandfold if you actually hatch some sort of plan to find out. Things will be forever and ever awkward.
why on earth is it any of your business what goes on in sisters punani? creeper.
I am protective