What he probably meant was that he was very close to ejaculating each time. He probably was really enjoying how you were masturbating him and didn't want it to end by ejaculating too quickly. By having you stop for a few seconds it stops the urge to ejaculate right then and there. Also, some men's penises become very sensitive (especially right after ejaculation) and the stimulation which usually feels greats becomes painful. Why dont you just ask him about it when you aren't in the midst of masturbating...I'm sure he will tell you.
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