When you tell her you are about to "COME," she says no, don't, please just keep going.
Shenron: THAT IS BEYOND MY POWER.
Beyond Shenron's Power
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This joke is all about innuendo. When the person says "come," they mean climaxing during sex, but the woman wants to keep going. Then Shenron, a dragon from Dragon Ball who can grant wishes, says he can't even help with that because it's too much.