help! how do you handle this?

..... Dont make a big deal. Dont bring it up be cool y'know. Dont say anything to your folks. Dont talk to her for a bit unless she talks to you first. Act like it didnt happen. Dont ignore her, just dont bring up the subject...

Alright, uh, I would say make no mention of it. I'm sure right now she thinks it is in the end of the world while wallowing in embarrassment, but she'll get over it. However, if the opportunity presents itself it might be good to tell her that it is okay and that everyone does it depending on whether she knows that yet or not.

but only if she brings it up first right? if you bring it up she might get mad at you cuz shes embarrassed

Depends on the situation and their relationship.

Why don't you explain to her what masturbating is and it's normal in life...just don't do it too frequently....

That's something I'd leave the fuck along for the time being. At least until you gather your wits about what exactly to say...

Teach her how to do it properly.

No, if you're a father figure...

Just start talking to her, but start a light note. Maybe take her for ice cream or something?

And then when the time feels right, you can ask about it (if you want). Or you can just forget the whole thing. But ice cream's still good.

Well. I don't know. Just try to talk to her. But be gentle bro not harsh.

You can break the ice by telling her, that next time she should do it where she wouldn't be disturbed. If you ever catch her at it again, just turn around and tell her to call you when she's finished.

Chances are she'll be damn embarrassed and probably also mad at you. Still it will be better than being embarrassed and ashamed, so at least she'll be able to talk about it.

...and no you can't masturbate too much. (I know. I tried to when I was a kid).
You don't have to tell her its normal, just act like it's normal. Asking whether someone does it is like asking whether someone is breathing. Everyone does it.

Since your a father figure and very lose to your kid sister, you gotta do that talk about the birds and the bees and masturbation is normal yada yada. It has to be done.

If we were talking about a little brother here, then you go ahead and have a good male bonding talk. (I handed my porn stash down to my brother)

But this is your sister you're dealing with. Explain the situation to a grown female who she is familiar with and try and get them to handle it.

[size=10]after some good thinking:[/h]

Feel yourself guilty for ruining her pleasure and Apologize.

she'll conclude the rest.

Time for you to teach her about the birds and the bees. And by that I mean, put it in her.

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Either leaving it be or bringing it up to her would be fine. I would not consult a female authority figure, as that will only embarrass her more. If you do talk to her, make sure it is very casual -- and this sounds silly, but do it where she has a "escape route". If the conversation goes badly, or turns extremely awkward as it probably will, you don't want to be in the car 30 minutes from home and have to sit there together. Might be best to do it at home where she can go into another room if she's uncomfortable or upset.

Chances are, if she's trying to get a quickie in at your house, she's already fairly comfortable with herself. I'd imagine most girls who think masturbation is dirty would only do it in their own bed, at night, with no chance of being caught. In their element, you know? If she's doing it in a risky place, I think she's got the right attitude. I'm not sure if a talk is really necessary.

As someone has said, she probably thinks this is the end of the world. My parents found my porn when I was 12. I wanted to die. They asked how I knew about all that stuff, was I being sexually abused, etc. (I wasn't, I was just curious and horny.) They made it very awkward, but at least they didn't outright say it was dirty or unacceptable. That's probably the worst you could do -- to say that it's abnormal or immoral, etc.

I would say, act as if it never happened. Just talk about normal stuff when you see her again. Don't make her talk to you first, because that will be extremely difficult for her. She probably can't stand to face you right now.