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What things do you guys do when you're with your girlfriends to post her attraction?
I'm seeing mine in a few hours so would love to know what advice you guys have.

This has a lot to do with your ACTUAL personality. Pick-up routines and techniques only get you so far... the longer a relationship lasts, the more you need to allow your NATURAL self to come through. That's why the approach I favor BEGINS with maximizing the attractiveness of your natural traits, starting at the very opening of the set.
There are some generalities that will apply to your situation, but the best advice is based on your individual personality. So if you want to say a little bit about what you're good at, and what your interests are, that will help give a more specific answer.
In the meantime, keep up the kino. Keep up the confidence. If your pickup style includes negs, then you need to adjust the NATURE of your negging... It should be more obvious, and also more playful, and less insulting. The playful dynamic of razzing each other is fun when properly applied in a relationship, but now the relationship is different, and the purpose of negging is different, so the negs themselves need to reflect that. Ever seen a happily married couple teasing each other in good fun? Needs to be like that.
After the seduction, to develop a relationship, you also need to show a little more vulnerability to make you more human.... Women will quickly feel like you're showing them a MASK if you keep up the pickup persona for an extended period of time, and it creates problems.
The main thing that stays the same is the need to have GOOD times together... keep conversation topics primarily upbeat and fun, the more she smiles and laughs with you, the more attractive you are. If you've already had sex, your flirting can be a lot more overtly sexual, but keep it tasteful, particularly in public, or at least keep overtly sexual flirting to a private level (whispering in her ear is a good way to get close and get her warmed up)