**\ All**** characters are18 years old or older. FFFF/m familial BB with no real other kinks, No: race, religion, body shaming, no curse words, and no animals were injured in the writing of this story.** ******\
Mike was completely overwhelmed by stepmother Mei’s repeated knee assaults. He had never been hit in the testicles before. Sure a light bump here and there, but Mei was venting frustration in front of his stepsisters.
He was just starting to see clearly when Sue stepped directly in front of his face. He was slumped in his chains on the Saint Andrew’s Cross, so little Sue’s eyes were level with his.
Sue was not smiling, like her mother Mei this was vengeance and pure hate. Before he could focus on his little stepsisters’ face, he noticed that her pajama top wasn’t buttoned completely and her left tit was swaying in and out of view as she moved.
Mike looked at her small nipple on such a large boob. It was hard enough to cut glass, she was enjoying her first ballbusting.
Mike watched with anticipation for the nipple to appear again, when her tit came completely out of her loose pj’s. He was watching her perfectly firm breast and not her fist. Sue’s boob feel out because she pulled her arm way back to punch as hard as she could.
Splattt !!
Sue’s fist connected with both balls and all her strength. The upper cut smashed the bottom of both balls, drove them up onto this lower abdomen. Her fist continued up briefly blocking Mike’s view of her left tit.
That was his first indication that something was happening. Her fist stopped about eye level and she stared into his eyes with malice as she turned her fist and drove it back down towards his crotch.
The pain from her first punch was just beginning to register when he felt her fist pound his helpless nuts from above. He wanted to scream but there was no air in his lungs.
He gasped for air like a drowning man whose face just broke the water’s surface. He had just filled his chest with air as Sue squatted slightly in front of Mike and began driving straight jabs into his rapidly swelling orbs.
With her strong hand Sue delivered straight punches one after another directly into his sac. Be as she’s right handed his left nut was swelling faster than his right ball.
Sue’s expression barely changed, she was on a mission. Ever since she learned about her mom’s plan, she dwelt on the time Mike accidentally punched her in the face. She knew it was an accident, but she barely slept all night anticipating this beating.
Sue began alternating left and right punches, interlocked her fingers and swung both fists up from underneath Mikes bruised balls.
Mike never did get to breathe fully, Sue was relentless. Her pajama top was completely unbuttoned and her tits appeared to defy gravity. So firm, so large, and those super hot nipples were pointing out at full mast.
Sue was tiring of her latest speed bag punches and stopped to look at him. Mike was hanging from the chains limp and drooling, as Sue held his head up by his hair. She looked him in the eyes and for the first time she smiled.
Mike thought it was her pride in her punching, which was impressive, he had to admit it to himself. Unfortunately Sue was smiling because she had her second wind and was about to give it everything she had left.
She stepped back and began throwing wild full arm swings, hammering his groin without a pause. Swinging so wildly that a number of punches missed his balls either completely or the blows were slowed by hitting a thigh.
Because his balls were now swollen and heavy they hung lower than usual. This exposed his dick which got hit almost as much as his balls.
As Sue was slowing down, Mei told her second daughter Lee to get the sample kit from the fridge, and the oldest daughter Mako to get the vibrator. She was going to measure Mike’s sperm count to record its decrease.
Sue saw her sisters leaving the room and thought her time was over, so she went at Mike’s nuts with renewed enthusiasm. She was on one knee driving her strong arm with her whole upper body, slamming her fist repeatedly into the swollen sac before her.
Mei walked over beside Mike and encouraged her daughter to get out all of her frustration. Sue listened and tried even harder. She finally stood panting and lifted Mike’s head.
Somewhere during the barrage he had passed out. As her sisters returned Mei told Lee to put the date on a label for vial number one. Every week they would do a sperm count.
She took the vibrator from Mako and started to arouse Mike’s limp dick. Lee asked for the vibrator, as she had never given a guy a hand job before.
Mike came to right as he was about to cum. He couldn’t understand his surroundings, but knew he was going to blow his load. Mei aimed his dick head into the first vial, and held on.
Lee worked the vibrator slow and steady as his body tensed and he began to shake. As he began the most painful orgasm of his life, Mei explained that she wanted both the amount of ejaculate and the number of sperm per square centimeter on a microscope slide.
She began to milk Mike’s still throbbing cock saying that she wanted every last drop. Hearing this, Mako reached between Mike’s legs from behind and grabbed is bulging scrotum.
Mako squeezed into the swollen mass and found an intact testicle. She squeezed hard, just like her mother draining every drop. As she crushed his sac she felt the second testicle and drained it as well.
Mei said to put the vial back in with the others, and put the box of vials into the refrigerator. Then she told Mako to start breakfast, Sue to go shower as she was all sweaty and worked up.
Lee and Mei released Mike’s arms from the chains, but he was too heavy to hold up and he fell face first on the floor. Mei said, “looks like his nose broke his fall”. Lee said, “or his nose just broke“.
They left Mike sleep off his hangover and joined the others for breakfast. Three maybe four more months of this until anyone would come looking for Mike. He was studying for the Bar Exam, and grieving the loss of his dad.
And bonding with his new family…