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She also said she has no freakin clue what makes her come...
This is typical so asking a girl how you can make her cum is like talking German to a Siamese cat. Several researches indicate that 100% of girls have no clue. The only time they got a clue was when the scientific researchers identified each part in the vagina and the accompanying sensations associated with it. That's the only time that the girls in the studies had clues.
Based on anecdotal personal experiences, I often hear girls say, "What are you doing? What's that you're hitting? It feels so good." Then I would say this is the spot just below your cervix at 11 o'clock or whatever. The next time we go into a fuckfest a few girls will request a particular spot but most will ask for everything I've got.
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...sometimes the same things that don't work DO work, and if I was doing something wrong she would tell me but everything I do is good/similar to what has gotten her off with/without me in the past.
As I've said, everything is about the timing, right spots, right speed and escalation. Her vaginal parts will always remain the same. However, the sensation she will feel will vary due to those factors that I've already mentioned.
Note that this is not a hard and fast rule.
During a first fuck fest, a girl will cum so fast after less than a dozen thrusts due to anticipation and excitement. So there's a psychological component too on how fast she can cum but it's not a big factor in the long run.
Another factor that you should consider is that when a girl is drunk, it's gonna be difficult to make her cum.
If you want to know which parts make your girl cum faster, this is my technique on how to do it. What I do is probe all parts inside a girl with my penis. But I don't shoot at random. I invest sufficient time and effort per part and bang the girl in that one spot until she cums. If after 3 to 4 songs and she's not cumming in one particular spot, I change the spot and focus on that for another 3 to 4 songs.
What you don't want to do is to keep on changing the spots you're hitting every few seconds or every few minutes. You have to sustain the pressure at escalating (yet sustainable) speeds until she cums.

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Approach. Open. Escalate. Isolate
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