She was generally waiting for you to escalate and thats why she moved on, remember girls want an alpha male who is not scared to close them. Don't beat yourself up about it but you lost out, its easily done, man up and move on. You wernt really that bothered about that girl was you? Exactly. When a girl properly grinds on you and you can feel the tension, then she wants to make out, you just need to work some magic to get there first

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But I'll go through some of my techniques with you.
Grinding is pretty simple.
just some points to consider:
When grinding from the front (i.e. Facing her)
put hand on her lower back, and other hand on her waist. you can mix it up a bit if you wish, but thats the general rule, also put her arms round your shoulders. Easy make out
Grinding from behind, you basicallt want your balls to rest on her arse haha thats how close you need to be, again one hand on her waist and the other on her stomach. Or you could grab her hands and place them with yours on her stomach, this will make her feel more comfortable.
Then spin her round and go for the make out.
Grindings easy, you'll pick it up as you go along, makes things SOOO much easier in terms of K-closing and building attraction, comfort and partly seduction all in one action.
I learnt myself but those are generally the rules you need to follow and you'll be sound

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