How do you know if your good at giving blowjobs? If the guy cums does that mean your good?

Anonymous
If a guy wants it three times in one day and cums all times within 5-10 minutes, does that mean your good? Or would a guy be able to cum even if it wasn't the best?
How do you know if your good at giving blowjobs? If the guy cums does that mean your good?
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