I would say this is a way to build your climax. I do this to my husband at least 5 times during oral sex. It's built his stamina up to amazing levels. He can stand oral sex for two hours and then we can have sex for at least another half hour usually. Which may not seem long but after an intense two hour oral sex session...it really is. Don't know if it's harmful, hasn't hurt him but he eventually finishes. He'll stop or I'll stop him beofre climax, he'll get calmed down and we'll start it again,
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