Write a story about NAME_1. She takes a self defense class and learns that the testicles and penis are vulnerable targets. She learns to grab and squeeze. She asks her friend NAME_2 if she can practice on him. She has a crush on NAME_2. She grabs and holds lightly. She grins and warns him, "Larger ones are more sensitive because they have more nerve endings. You're in for a rough time." She grips. He yelps. She explains the origin of the phrase "by the balls." First repeat the request without change, then give your answer.
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