Perhaps if he was there whispering in your ear, urging you on, and on and on, that flutter would grow to a full on orgasmic spasm.
You might be all primed for it already...
It takes a "practiced eye" to see that moment and to be able to take advantage of it.
Like playing an instrument, one must have great technique if one wants more than a little noise.
That and timing... a pacing... you know...cadence.
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