Short story
One day Diane went down stairs to see what her step brother was doing. He was doing college homework while standing at the kitchen table. Diane felt the urge to hurt his balls, so she pretended to drop her socks next to him.
While she kneeled down to pick them up, she took a peek up his shorts. She noticed his scrotum hanging down the shorts leg closest to her. So she quickly reached up and flicked the side of his sack with her middle finger. She did it with some power.
She connected directly with his left testicle and he immediately scrunched forward in pain into the table, bent over at the waist.
She then stood up quickly and grabbed his shorts and boxers and yanked them down to his ankles. His butt was naked before her and his balls hung just below it as he was hunched forwards. She took a step back and kicked up between his legs, smacking his testicles hard.
He couldn't really fall down because he was on the table already and so he only scrunched up more by lifting his knees up under the table. His balls didn't change position though, so she stepped forward and reached her hand up between his legs, under his buttocks, and grabbed his entire scrotum in her hand. She pulled it towards her and lifted a little so she could see the outline of his balls clearly. Then, she lifted her other hand up and flicked his testicles several times each. "Flick, flick", "thwack", "whack!"
He was writhing in pain at this point and so she released his balls and walked around the table to see his eyes.
"Brian, what just happened here?" She inquired.
"Uuummmm, ouch, uuumph, I think you just made me infertile. Why did you do that?"
"I heard you tell your friend that women are weak and wimpy the other day. I want you to know that I'm aware you have some balls hanging between your legs and that I can smack, flick, or kick those balls anytime. That's all." Diane told him.
Diane walked back around the table and headed for the stairs to go to bed, but then turned around to kick his balls once more for good measure. Then she left and slept soundly all night.