A fellow DJ shall help =)
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she flirts quite a lot and can be very crushy to guys, C & F does work but when i tease her a bit she may take it seriously and become upset and stuff
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Well in that case, you might be overdoing it sir! There are a few cute 15 year olds I know and I try the C&F stuff but I tend to use it lightly so I don't come off as some huge @$$hole. My theory is, once the younger ones get a firm image of who you are, they will stick to that idea of you and act based on it. So yeah, if she's getting all worked up over your C&F, just say something like, "Heyyy~ chill out, can't take a joke?", but if u go really overboard, an apology never hurt anyone.
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i guess this has to do with her being a bit insecure about herself, she is not your most confident girl so she may take teasing seriously or affraid of being rejected so she never makes approaches herself
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In that case, be wary of your C&F, because you just might insult her. Also, since shes afraid of taking the risks, I suggest you be the man and lead things =)
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she does reponse well to afcness though, like if you start compliment her, being nice n sweet n caring n stuff, she would become more open and friendly n start flirting with you
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If she's more responsive to AFC behavior and she's more flirty and stuff...I'd still be cautious really. Why not break the ice with a little bit of AFC stuff...like a compliment or be nice for JUST A LITTLE BIT, then use C&F/Kino, but don't over-do it, since you say she's insecure/inconfident.