In addition to what was written above, (v was a bit too technical about the time, the OP will be programming his phone's various alarms to ring at the different time points  ), I would emphasize that you occasionally go for the lightest, gentlest possible kisses on her clit. These light, barely touching kisses would drive her crazy as it would it feel like electricity to her.
Also for some girls when they are close to cumming, I would be fingering her g-spot furiously as I sucked on her clit.
Like Indefine said, every girl has different response when they get the O. Clamping your head with their thighs is one. Arching the back is another one. Full Body shaking is another. Trying to push you away is another sign - it means that she just had her O and now her clit has become really painfully sensitive and doesnt want to be touched anymore, you can continue with licking her pussy lips but avoid the clit. Screaming and moaning can be faked. The others above are difficult to fake esp if the girl is not an Olympic athlete in control of all her muscles. | |
), I would emphasize that you occasionally go for the lightest, gentlest possible kisses on her clit. These light, barely touching kisses would drive her crazy as it would it feel like electricity to her.