Ok, I made huge progress. It was my first sarging and I got a girl's number on my 3rd approach. I never thought it would be that easy. But what next? Should I wait some time or just try to arrange a date the next day? And what exactly should I do on the date? Should I buy her a drink or smth. or just let her pay for herself?

1) Golden Rule or whatever you want to call it: You wait two or three days before even thinking about calling or texting her. You have to show her that 1) You're not needy 2) That you yourself have a life.

2) When you try to arrange a date, try not to do it over text because it shows that you are very nervous.
3) You're out there TO HAVE FUN. It may show chivalry to pay for everything that she wants/ has but you could be seen as an easy guy. She could walk all over you or just get annoyed. I'm not saying don't pay for anything but you could offer to pay.

edit: 4) Go for the k-close at the end. If you get a girl to go out with you, it's practically guaranteed to get at least a k-close. Unless you mess up badly.

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"There’s no such thing as a good girl gone wrong, only a bad girl found out.”