Mom continues son's education

*(This is a sequel to the story* [*"Mom educates son"*](https://www.reddit.com/r/BallbustingStories/comments/1b3l4aj/mom_educates_son/)*. All characters in this story are over the age of 18.)*

Zach tried to pop his hips back, but he was too slow. His girlfriend Olivia's perfect foot smacked into his cup, bouncing it upward and sending waves of pressure through the plastic and into his testicles. Zach immediately dropped to his knees, holding himself and grimacing, as pain shot through his lower body. The other students in the taekwondo class made "oohs" of sympathy or laughed, and someone said "That's like the fourth time she got him this week."

Olivia stepped back and gave her stricken boyfriend time to recover. She was 5'7", lanky and pale and cute, and she had dyed her dark hair blonde this year. She and Zach were home from college again, and they decided to re-enroll in their local summer taekwondo class. Naturally, they were sparring partners. Zach was a bit quicker and stronger, but Olivia was more precise and had better control. And now that Zach always made sure to wear a cup, Olivia felt safe taking frequent advantage of his special male weak spot.

After thirty seconds down on his knees, Zach got up and started to walk off the groin strike, bending his back up and down and periodically pausing to take deep breaths. Olivia walked over and gave him a slap on the butt.

"Gotta learn to guard your baby makers," she teased him. "I think that's the third time I've nailed em this week."

"Fourth," Zach grunted painfully.

"Oh yeah, I guess so," Olivia said, smiling. "Wanna go again, or are you done?"

"Let's go one more round," Zach said. "I'm OK."

They stood apart from each other and bowed, then went into their fighting stances. Zach was careful to keep his side to Olivia so his groin didn't present as tempting a target. He kept his kicks low so she couldn't counter between his legs. But Olivia knew how to deal with his protective measures. When he threw a punch at her head, she sidestepped it and moved in, reaching around to slap her boyfriend in his cup. When he doubled over, she swept his leg and knocked him to the ground.

"That's five," Zach wheezed as he looked up at her from the ground. "I think I'm done for today."

He and Olivia said goodbye to the rest of the class and walked back to the car. "I don't know why I let you beat up my balls all day," he said, shaking his head.

"It's all thanks to your mom," Olivia said, ruffling her boyfriend's sandy mop of hair. "If she hadn't taught you to wear a cup, I'd be too scared to hit your balls. This way I can safely kick the hell out of em."

"Thanks a lot, Mom," Zach muttered.

"Anyway, tell your balls I said I'm sorry, and I'll make it up to them on Thursday when my parents are away," Olivia said, giving Zach a kiss on the cheek and reaching out to give his crotch a gentle squeeze. She felt him stiffen in her hand.

Zach was excited for Thursday. But he also felt a little humiliated at how often his girlfriend was able to bring him down with her nut shots. It was so one-sided. He was always the one kneeling or doubled over in pain in front of her. He was starting to worry that she didn't respect him.

Back at his house, Zach encountered his mother Melissa doing the laundry. She was an attractive woman in her mid-40s, in good shape, curvy and athletic, with auburn hair down to her shoulders. She and her son had always been close, and he turned to her for help now.

"Mom, how do I block groin strikes?", he asked. Melissa had done karate for many years, and she was the one who had first taught him the need to protect his male anatomy.

"Why?", she asked. "Is that girlfriend of yours giving your balls a hard time?"

He nodded. "She gets me a lot," he complained. "I try to avoid her strikes but it's like she's a heat-seeking missile for my balls."

Melissa laughed. "There are worse things for a girl to be," she said. "OK, I'll help you out in a bit."

Half an hour later, Zach and his mom stood in their living room in their martial arts outfits. They had cleared out the furniture to make space, just like they had a year ago.

"OK, this lesson is going to involve me striking your cup a lot," Melissa warned. "That's going to be painful, but it's the only way to learn to block groin strikes. The faster you can learn, the faster it'll stop being a problem."

"My balls are as ready as they'll ever be," Zach said with a nervous grin.

"Actually, let me check to make sure your cup is on right," Melissa said. She walked over and reached into her son's pants.

"Come on, Mom," Zach sighed, rolling her eyes.

"Hey, can't be too careful," his mom said. "I don't want any chance at all of losing my grandkids."

Zach waited in patient embarrassment while his mom's hand probed the cup between his thighs, making sure his balls were snugly inside it, and that it was pressed up against the bone. When she was satisfied, she took away her hand and stepped back.

"OK, there are several ways you can block a front kick to the groin," Melissa began. She began to teach him, showing him how to check a kick, how to parry, how to twist his hip, and so on. They practiced each move slowly, then at half strength. Only once did Zach execute a parry incorrectly and suffer a foot to his cup. But it was only a light kick, and he only felt a brief twinge of pain.

Then Melissa ran him through the drills more quickly, kicking harder and faster. Zach was a quick learner, but he was still only a blue belt in taekwondo, and his mom had done karate for ten years. A kick slipped through his defenses and smacked into his cup. Zack crumbled to the ground, holding himself and feeling pain blossom in his groin.

"Sorry, kiddo," Melissa said, feeling guilty. "You're getting better though. You almost blocked that."

After half a minute or so, Zach was able to struggle to his knees. He stood up gingerly, taking deep breaths as he fought to recover from the now-familiar pain. Melissa watched in sympathy. She didn't want to hurt her son, just to teach him. But lessons often involved a little pain.

They continued practicing, and Zach managed to deflect all of Melissa's kicks, except when her toes grazed his cup once. "That was great!", Melissa told him. "Now let's practice defending against hand strikes."

Once more she taught him a series of ways to evade, parry, or block a punch or slap to the crotch. But Zach seemed to have a harder time with these than with the kicks. Melissa was shorter than her son, 5'5" to his 6 feet, and that made it harder for him to see where her hand was going when they were close in. She ended up nailing him on one of the first full-strength strikes she tried, sending him back to his knees on the carpeted floor.

"Fuck," he breathed softly, his eyes tearing up.

"Want to continue this tomorrow?", Melissa offered. "I'm not sure how much more pain your balls should take today. That's what, five times you've been hit there?"

Zach nodded, his face scrunched up as he held his throbbing testicles.

The next day the lesson continued. Zach's balls had mostly recovered from the various blows they had taken the previous day. He was quicker on his feet as a result, and he learned to effectively stop his mother's hand strikes. But she was still much better than him, and his defense wasn't perfect, so eventually he twisted too slowly and her fist punched up into his cup.

"Aaahhh!", Zach said, toppling to the floor and going fetal. "God DAMN it!!"

Melissa winced in sympathy for her son. She gave him some whacks on his butt, which supposedly helped a little with the pain. Zach whimpered softly. But after a minute or so, he was able to get up.

"Wanna stop?", his mother asked. He shook his head. "Let's keep going. I have to learn."

Just then Zach's father, David, walked in the front door and saw his wife and son sparring in the living room. He was an inch taller than Zach, with the same sandy hair and a lean, athletic frame.

"Hey, what's going on here?", he asked. "Giving the boy some karate lessons?"

"Sort of," Zach said. Melissa flushed, too embarrassed to tell her husband exactly what she and their son were doing.

"Your mom and I did karate together for almost ten years," David told his son. "She was always a little better than me, too." He walked over to put his hands on his wife's shoulders.

"You guys were sparring partners, right?" Zach asked. He tried to imagine his parents in the same position as Olivia and himself.

"That's right," David said. "I was always trying to stop myself from getting distracted by how hot she looked in that gi." He ran his hands down Melissa's arms.

"Did she ever -" Zach started to say. "Zachary!", his mom snapped, blushing. "Stop it."

"Did she what?", David asked. Melissa threw her son a furious look, begging him to stop embarrassing her. But he pressed on anyway.

"Did she ever hit you in the groin?", Zach asked.

David threw back his head and laughed. "Oh my God, all the time!", he said. "Your mom's feet are like heat-seeking missiles." Melissa snorted, remembering that Zach had used the exact same metaphor the day before. Like father, like son.

"You know what they used to call her in karate class?", David asked. "David!", Melissa said, blushing again, but he continued. "The RACK," David told his son. "That was her nickname."

"David, don't tell him that," Melissa mumbled.

"It's a pun, see?", David explained. "Because 'rack' is an old term for when a girl kicks a guy in the nuts, and also because your mother has a famous rack of a different kind."

"Honestly, David!" Melissa snorted, hiding her face with one hand.

"Didn't it hurt, to have her rack you all the time?", Zach asked, feeling kind of ashamed at the thought of his father on the ground at his mother's feet.

"Hell yeah it hurt!", David laughed. "But it was OK, because she would always make it up to me later." He nuzzled his wife's neck as he said this.

"OK, I think this is too much information for our son," Melissa said, even though secretly she was getting turned on at the memories.

"And then there was the time we decided to spar in the nude," David said, grinning.

"OK, ENOUGH," Melissa declared. She turned around and started pushing her husband out of the room. "OUT, OUT, OUT!!"

David walked away, laughing. Melissa, blushing furiously, turned back to her son. He was grinning at her, amused.

"Sparring in the nude?", he asked, crossing his hands over his chest.

"It was the 90s, OK?", Melissa mumbled, as if that explained everything.

They practiced a little more, and Zach managed to block all of his mother's strikes. She seemed distracted and embarrassed by the conversation with Zach's father. Finally, she declared that the lesson was over and Zach was ready to face his girlfriend again.

Zach left to go hang out with his friends, but he forgot his wallet in his room. Parking his car in the driveway, he decided to take the back door through the basement, since it was quicker. But when he walked into the basement, he saw a sight that he had definitely not wanted to witness.

His parents were making love on the basement couch. David was on his back, and Melissa was on top of him, completely naked, riding him. She looked up and saw her son, standing there gaping at her. With a shout, she covered her ample breasts, clutching for a blanket to hide herself and her husband.

"I'm sorry, Mom! I'm sorry, Dad!" Zach shouted, turning away quickly and heading back up out of the basement. "I didn't see anything!!"

Flushed and embarrassed, Zach went the long way around to his room to get his wallet. As he went back out the front door, Melissa walked up to him from the hallway. She had a short bathrobe wrapped around her, and she was holding it closed with her hands. The robe didn't even reach down to mid-thigh, leaving most of her well-muscled legs bare. Zach averted his eyes, embarrassed to see his mother in a state of partial undress.

"Hey, kiddo," Melissa said. "I'm sorry you saw that. I'm sure you know that your father and I have a healthy relationship, and that includes -"

"Yeah, it's OK Mom," Zach said. "I know you and Dad have sex. It's all good. I was just startled. Besides, you saw me and Olivia last summer, so we're even."

Melissa laughed, remembering walking in on her son getting a blowjob from his girlfriend. "That's true," she said. "We're even."

"OK, I'm off to class," Zach said. "Keep Dad entertained for me."

"Do you have your cup?", his mom asked.

"Yes, I have my cup," Zach sighed. "Thanks Mom."

"Just checking," she said, blushing. "Take care of those balls, OK? I want grandkids."

Zack snorted and walked out the door.

Two hours later, he and Olivia were facing each other on the sparring mat, breathing heavily. Today he had gotten the better of her in sparring, and she hadn't managed to land a single groin strike.

"OK, who's teaching you to protect your nuts," his girlfriend joked.

"My mom," Zach answered, grinning.

"You're kidding!" Olivia said, laughing. "You asked her to teach you how to block groin strikes?"

"Yep," Zach said. "She's a very good teacher."

"I bet it was a painful lesson, though," Olivia said.

"No pain, no gain," Zach shrugged. "But I'm willing to give you another shot at my balls, on one condition."

"What's that?", Olivia asked.

Zack leaned over and whispered into Olivia's ear. "Spar with me naked," he said.

Olivia threw back her head and laughed. "You're nuts!!"

"Exactly," Zach said with a smile.

"Let's discuss this at my house," Olivia said.

Zach and Olivia had her parents' house all to themselves. They had been looking forward to this night all week.

"You ready?" Zach said, stripping off his shirt.

"This is insane," Olivia said, blushing brightly. "If we spar naked, I'm going to kick you in the nuts, and you're going to say 'Oh God my balls, my balls,' and you're going to cry on the floor, and we're going to spend the next six hours in the emergency room."

Zach shrugged. "I doubt it," he said. "But it's always a risk! Let's raise the stakes. If I win, you stay naked for the rest of the night."

Olivia snorted. "You know I'll win," she said. "I'm better than you."

"Are you?", Zach said, smiling. "Then you shouldn't worry too much about losing."

"I'm just worried about destroying your BALLS," Olivia said. "Remember, I need those balls, for...stuff."

"Don't worry about my balls," Zach said. "They'll be OK." He took off his socks, then his shorts, then his underwear, and stood naked in front of his girlfriend. His dick was pointing straight out at her.

"You psychopath," Olivia laughed. "All right, let's do this."

She stripped off her own clothes as her boyfriend moved furniture out from the center of the living room. Zach admired her long lean body, slender legs, and adorable, modestly sized breasts. She was shaved down below. Her body was one long expanse of pink.

"You're so beautiful," Zach told her. He was very aware of his penis pointing right at her, with his vulnerable balls dangling in their exposed sack beneath.

"You too," Olivia said. "I'm going to hate to have to kick those balls."

"They're all yours," Zach said, taunting her.

They bowed and went into their fighting stances. Zach still had an erection, and he was very distracted by his girlfriend's beauty. But she was flustered and embarrassed at being naked in such a ridiculous, unfamiliar situation.

They did some circling and exploratory strikes, feeling the different balance from being barefoot on carpet. Zach felt his dick swing around awkwardly, and Olivia felt her breasts bounce against her chest whenever she made a quick motion. Both of them laughed, trying to stay focused.

Zach's balls were unprotected, so Olivia didn't immediately go for the groin strike. But as Zach blocked and parried her first strikes, she started to feel a little more like this was a normal sparring session. Out of pure instinct, she launched a foot at Zach's nuts. He parried her bare leg expertly. His mom had taught him well.

The two went back and forth, striking and blocking. Olivia went for an underhanded slap to Zach's balls, and he avoided it with a skillful hip twist. Olivia was impressed. He really had learned to protect his most vulnerable spot!

Zach realized that being able to block groin strikes gave him a slight psychological edge over his girlfriend. He slipped past her block and lightly slapped her in the cheek with his hand, drawing an "Oof!" of indignation. He saw the retaliatory groin kick coming a mile away, and stepped to the side, parrying it.

"Damn it, you really are good at this!", Olivia huffed. She was getting winded.

"Prepare to be my naked slave all night!", Zach taunted her.

"Slave?", Olivia shouted. "We'll see who's the slave!"

She sent a high kick at Zach's head. He backed up to avoid it, admiring the view of his girlfriend's bare crotch that the kick allowed him. But as he straightened up, Olivia dropped down and launched herself headfirst at Zach's legs.

He struck her in the shoulder with his hand, but he was totally unprepared for the move. Olivia reached out and grabbed her boyfriend's bare legs, sending them tumbling to the ground in a heap of flailing naked limbs. Zach wriggled to get away, but Olivia was too fast. She wrapped her legs around Zach's, and her hand reached down and wrapped around his balls.

"Ahhh!!" Zach shouted in sudden terror. "Fuck!!"

Olivia squeezed him, not enough to put him in true agony, but enough to make him feel helpless. She rolled on top of him, triumphant.

"I give up, I give up!!" Zach shouted frantically, his hands fluttering near his captive balls.

Olivia leaned over and pressed her mouth to his, giving him a long passionate kiss as she gently squeezed his prize possessions in her hand.

"Did I mention I also did six months of Brazilian jiu-jitsu?", she breathed, smiling sweetly.

Zach couldn't help but laugh. "You win," he said. "I love you." He put his arms around Olivia's bare back and drew her down to kiss her.

"I guess that's what they say, right?", Olivia said. "The way to a man's heart is through his balls."

"That's not what they say," Zach whispered, and kissed her again. She let go of his balls and grabbed his penis instead, slipping it inside her. Zach sighed in ecstasy as she undulated her hips up and down on top of him.

Just then, Zach's phone rang. At first they ignored it, but it rang again. They paused, and Olivia reached his hand over into the pocket of his nearby pants to fish it out.

"It's your mom," she said. "I'm going to take it."

Zach laughed. "Go ahead," he said.

"Hello, Mrs. Allen?", Olivia said, putting the phone on speaker. "This is your son's girlfriend."

"Did I interrupt anything?", Melissa asked.

"Yes, we were having sex," Olivia said matter-of-factly.

"Oh good," said Melissa. "Well, you two enjoy that. I just called to tell you that Zach's father and I have decided to go on a surprise three-day trip up to Yosemite. You two can have the house to yourselves while we're gone."

"Thanks, Mrs. Allen," Olivia said. "Thanks, Mom!", Zach shouted.

"And one more thing," Melissa said. "Please don't rack my son too hard, OK? I know he's an idiot but he needs those balls of his."

"Yes, Mrs. Allen," Olivia said solemnly. "I'll only rack him a little bit, and only when it's funny."

"Good," said Melissa, "That's all! Bye-bye!"

Olivia hung up the phone and set it down. Then she reached down with her hand and gave Zach a light slap in his balls.

"Aaaghhh!", Zach said, half laughing and half crying. "My mom gave you very specific instructions not to hurt my balls!"

"Unless it was funny," Olivia corrected him, starting to move her hips again. "That was funny."

Zach could only partially agree.

​

*(The end)*