The best sister in the world. One extra chapter!

This story is a cross over with u/smasher6446

..........

Lola and Max were at the bus stop trying to make their way home after a day on the beach.

Max was wearing sandals, a t-shirt and his trunks with no underwear. He'd been looking forward for the whole week to spend a day with his sweet sister Lola and no underwear to protect his balls. Unfortunately Lola hadn't struck a single kick and the day was coming to the end.
He was visibily down in the dumps. He hadn't said a single word since they left the beach.

Lola knew very well why her brother was so silent. She spent the day mostly hanging around with her friends, she hadn't had a real occasion to kick him in the balls.

"Is something wrong Max? Why you're so down?" She wanted to start a conversation and maybe turn it into some kind of verbal ballbusting teasing. That was the only thing she could do in a public place.

"I wanted to spend some time with you and maybe have some fun but you spent all the day around your friends" he poured out.

"Oh come on Max! You did the same. You've been playing volleyball with your friends the whole afternoon!"

"Well of course that i have. You're the one who left me alone!"

"Don't argue with me boy. You know what happened when you piss me off!"
Lola said when something attired her attention.

A beautiful, tall boy a few meters away. He was walking side by side with a blone girl. Lola bit her lips staring at him. He was a mountain of muscles!

"Why? What will you do if i keep on arguing?" Max asked.

"What will i do? I...I'll do something nasty... " Lola was still transfixed by the handsome boy and couldn't stop ogling him. Her eyes popped out when she saw the blonde girl punch him in the balls.

"Something nasty? Do i have to be concerned for my..."

"Look Max!" Lola tugged on Max's shirt and gestured him to look at the big boy. "That boy" She whispered. "The blonde girl just punched him in the balls!"

Max raised his head to see a tall boy walking clumsy and a beautiful blonde girl smirking.

The boy said something Max and Lola couldn't understand due to the distance and all the noises of the street, but it was clear that he was arguing with the girl.

"Look Max! I think she's about to hit him again" Lola whispered and she was right. The blonde girl kneed the boy right in the balls.

Lola laughed for a moment and quickly moved her eyes covering her mouth. "That was funny! He can barely walk!" she giggled.

Max didn't laugh. He was embarrassed. The scene aroused him. "Don't stare Lola. It's not funny" He looked down. His face was red as a tomato.

Lola smiled when she noticed how her brother was getting aroused. "Yhea it's funny! That boy is so big. I love how she can tame him with just a punch in the balls!" Lola let out and "Yhaa!" and fake a punch to Max's balls.

Instinctively Max closed his legs. "Don't be a jerk Lola. They're are coming"

The big boy and the girl stopped at the bus stop. Just a few steps away from Max and Lola.

"The mighty Derek. The owner of the world! Just a flick to your balls and you're down crying as a loser! How dare you to call me 'cow'? Did i not hurt your balls enough the first time?" the blonde girl said trying to not let someone hear her words.

Max and Lola stayed silent pretending they hadn't seen or heard anything. They were both listening. They wanted to know what was going on between the blondie and the awesome boy.

Lola smiled when she heard whe girl speaking. She was surprised to see how opened that girl was with ballbusting stuff.

Max didn't dare to raise his eyes from the ground. The whole situation was too embarrassing for him. He was eager to know more about the couple.

"But you're a cow sis! Every one calls yoy that since you grew that giant boobs! You're no Sam anymore. You just a C, O, W. Cow!"

Brother and sister! Lola was happy to know that that Derek could still be available.
Max heart was racing for the excitement!

"Don't argue with me boy!" Sam said "you know what happens when you piss me off!"

"What will you do? Nasty things? You're just a little girl! Can't do anything to me!"

Sam looked around to see if someone was staring at them.
At the stop there were only Max, Lola and another woman. No one was staring.

"What about this?" After a few moments out of nowhere Sam kicked her brother in the balls full force! The big tough boy managed to not scream but he fallen down on his knees.

Max and Lola didn't see the scene but heard the conversation, a loud sound and a boy groaning in pain.

The siblings moved their head to see. Lola couldn't help but giggling. Max just needed to jerk off.

"Come Max, let's meet them!" she whispered.

"No way Lola"

"It will be fun, come on!" Lola smiled and stepped toward Sam and Derek.

"No Lola... Wait..."

Max didn't know what to do. He was glad to have a chance to make contact with that beautiful ballbuster girl but what about his secret fetish for ballbusting? He had to be careful.

"Oh my god what has happened here? Are you feeling ok? May i help you?" Lola pretended to be worried for Derek and completely unaware of the situation.

She put an hand on his shoulder and bended over to look him in the eye. "Are you hurting?"

Derek gulped when he saw Lola. "I'm fine! Don't worry!" he moved his hands from his aching balls and and raised from his kneeling position. Beeing seen so humiliated by a good looking girl like Lola was too embarrassing for a macho like him.

"Are you sure?" Lola made a confused expression. "It looks like something hit your balls! That must be really painful!"

"No, no... It's not" Derek blushed. That beautiful girl concerned for his balls made him feel uncomfortable and a bit more humiliated than before. "I'm fine That was nothing! Men are tough!" he smiled.

Sam smirked. She knew that her brother was embarrassed by the presence of that girl.

"It didn't look like nothing when my foot met your balls" she said. Derek gave her a glare. "Don't worry. I was just teaching my brother to be more respectful. I'm Sam by the way. This is my brother Derek. Nice to meet you!"

Lola giggled. Derek looked kinda cute. A big macho man all embarrassed and troubled for a kick in the balls.

"My name is Lola. The boy over there is my brother Max" she gestured her sibling to come closer.

Max stepped toward his sister and the others, he waved his hand and let out an "Hi"

"Max, this is Sam and Derek. Derek the tough man!" Lola raised and eyebrow.

Derek smirked at her words and flexed his muscles making a pose to impress her. His moment of glory lasted only a couple of seconds.
Sam hit him right in the balls with the back of her hand.

"Ohh!" Derek bended over and closed his legs.

"Not that tough!" Sam smiled.

Lola laughed at the funny scene. The hit wasn't too strong and Derek was able to maintain his stand. "See, it doesn't hurt!" He said pretending to be cool.

"Really?" Sam hit again but a little harder. She loved to have someone to show how weak her brother's balls were.

"Ouch" Derek made a funny face but tried to not overreact.

"Oh my my, such a tough boy!" Lola teased and laughed. "Is my brother tough as well?" wasting no time she slapped Max balls the same way Sam did with her brother.

Max smiled but almost didn't react. He was used to much, much more pain in the balls.

"Ahaha Lola you're a funny girl!" Sam was glad to see how Lola was at ease hitting her brother.
"You know, i always have to hit Derek here and there..." She slapped her brother again as it was nothing "... He like to tease me, call me names..." Another slap, Derek tried to not show pain to impress Lola but his balls were on fire. "... I need to show him who's the boss!" another slap at the word "boss" this time an hard one.

"oh i see" Lola giggled. Derek was now holding his balls. He was squeezing his eyes to hold the pain.

"Ahah me and Max go along pretty well, don't we Max?" Lola hit Max in the balls. Max saud yes with his head. "some time i hit him too... " Another hit. "...but it's just for fun!" She stared at Max and playfully slapped his balls one last time.

Derek was kinda confused by the way Max didn't do anything to protect his balls and let his sister do what she wanted.

Sam was surprised as well. "Yhea. Balls can be fun to hit. You can also squeeze them!" quickly she grabbed Derek's balls and squeezed them. "they make a perfect stress ball!"

"Ahaha right!" Lola squeezed Max as well.

In that moment the bus arrived. Derek and Max were making funny faces and groaned in pain. None of them was able to free his balls from the grip.

Giggling like children Sam and Lola dragged they brothers in the bus by their balls, only then they released the girp.

The two girls sat next to each other and chatted the whole time. Max and Derek didn't say a single word for the whole drive.

.....

A week after Sam and Derek were at the beach. They were walking together along the shoreline.
Derek was following his sister without knowing where they was going. It looked like Sam was leading him in some isolated place. Away from the crowd.

"Where the hell are we going Sam? I don't know what keeps me from leaving you and join my friends"

"Do you remember Lola? The girl we met at the bus stop. We're going to see her and her brother. I thought you had a crush on her so i told you to come along!" Sam smirked.

"Lola? Yhea she's kinda cute!" Derek didn't questioned Sam any more and kept on following her.

Sam and Lola had planned the meeting for different reasons but with the same purpose. Bust their brothers in the balls.

Sam wanted to humiliate Derek in front of a nice looking girl and destroy his ego. Lola just wanted to entertain Max a little more than she did the last week!

They didn't tell each other the truth! They were complicit without knowing it. The two girls didn't know exactly what to do they only wanted to let the things flow.

Lola waved Sam from the distance. "Sam, Derek! Over here!" she called.

"Hi Lola! You were right this place is perfect for sunbathing. We're almost alone. I don't like to sunbathing in the crowd" Sam smiled and looked around.

"I know! This place is perfect for a little of privacy!"

Lola and Max were already in their swimsuits and sitting on the beach towels.
In no time Derek took off his shirt and glanced at Lola to see if she was staring. He sat down on his towel next to her.

Sam knew what to do. A little trick to start the fun. She casually yawned and stretched out her arms. In doing so she puffed out her chest. Her big breast giggled under the shirt.

Max's and Derek's eyes were gulted on her. She smiled, now that she had the boys' attention she could undress to her bikini. She slowly undo the belt of her shorts.

Lola didn't exactly know what Sam was doing but some how she saw an opportunity to tease the boys.
"Max don't drool while Sam strips, will you?"

Max winced and moved his eyes. "No i wasn't... I don't..." Derek was feeling embarrassed as well.

"Boys i'm just stripping to my bikini! Can't bealive you're aroused by that!"

"She's your sister Derek!" Lola exclaimed.

"I don't stare to her. None cares of her giants bongos. Am i right Max?"

"Right!"

"Are you sure boys cause it doesn't look like you don't care" Sam put her hands on her hips to give the boys a better view. "Let's see if you don't care" she slowly began to strip.

"Wait Sam!" Lola picked a bluetooth speaker from her bag and put on a nice strip tease song.

Sam was excited by the way Lola was teaming up with her without having planned anything before.

The boys swallowed. Sam began to dance with the song moving her hips sensuality. She took off her clothes glancing at the boys while Lola was cheering at her.

Where she was down in her bikini she kept on dancing. "Yhea let's dance!" Lola joined her. The girls were dancing with a purpose. Give the boys boners!

Max and Derek were starting at the sexy dance with their legs curdled up to hide their crotches. "Stop it Sam! Do you really think we're getting aroused. You jerk!" he didn't want to show Lola a boner for his sister!

The girls laughed. Lola put on another song and they kept on with the teasing dance. "Why you boys don't lay down and sunbathe while we dance?" Lola said with a smirk. "On your front, i dare you!... Hands on your sides!"

"Yhea why not boys!" Sam giggled. "I don't see why you shouldn't!" she teased.

The boys didn't said a word.

"Come on Max lay down!" Lola poked Max's shoulder with her toe. "Are you hiding something or what?"

Max couldn't resist any more. He knew what was happening. He knew his sister and he was loving her for what she was doing.

She laid down, hands on his sides. The girls laughed out loud when they saw the bulge on his trunks.
"Naughty, naughty Max!" Lola teased in a singing voice. "What should i do to you!"

"Max! A boner for your sister? She should teach you to respect her!"

"What the hell Max! Why you did that?" Derek just wanted to run away. The girls were taming them and Max wasn't any help.

"Come on Derek. Why don't you lay down too?" Lola kneed behind him. She pushed on his shoulders gently. "Don't be afraid Derek. Yes there you go! Down... Down on your back!"

Derek couldn't resist the seducion. He let surrendered to Lola's treatment and laid on his back, hands on his crotch.

"Good boy Derek now hands on your sides and..." Lola moved his hands and his boner showed up. "... Oh! You do care for your sister's boobs then!"

Sam smiled. Her brother was exactly in the position she wanted him.

"No, i don't. I'm out" Derek was about to raise up when Sam's foot smashed on his balls. "ooohh" he cried and held her ankle.

"Not so fast big boy! You shouldn't have show that ugly boner!" she pressed her sole down on his balls. "Stay on your back or else!"

"ooohhh ok ok sis. Just stop it!!!" he screamed and did what Sam was ordering.

"Wow you really did get a boner from your sisters boobs, let me help you get rid of that" Then sam presses down on her foot, crushing Dereks testicles. She watched and giggled as the pain from having his nuts compressed slowly deflated his hard-on

"Are my boobs giant bongos? What about your balls. I think they're even better as bongos!" Sam didn't waste time and sat on Derek's tummy, back to him. She made sure to pin his arms on his sides with her thighs.

She began to slap his balls as if she were playing bongos in time with the song Lola's speaker was playing.

"ahahah yhea! Let's make some music!" Lola sat on Max the same way Sam did and began to play her brother's bongos.

The boys groaned in pain as the girls kept on hitting their balls again and again. They didn't slap too hard but slap after slap the pain was increasing.

Max was making incomprehensible sounds but he never beg Lola to stop. She knew he was loving the torture!

Derek never stop to beg for mercy but Sam didn't want to stop. She loved to see him completely tamed, humiliated and emasculated by her slaps.
"No more tough guy?" Sam mocked Derek. "Lola is here. Show her who's the macho!"

The song ended and the boys had a moment to breath.

Lola stretched out her hand to reach her phone without moving from Max's body. She chose another song to play. As soon as the music started she returned to play her "bongos" and sang along.

Sam was amazed by Max. He was enduring the torture much more better than Derek and it looked like his boner was still there! She left her brother agonize on the sand and joined Lola.

*"Oh, she's sweet but a psycho
A little bit psycho" *she was singing and hitting Max's balls in time with the music.

Sam opened Max's legs and sat between them. She was right, he was still hard. She pointed at his boner and smiled to Lola. "He's still..." she whispered but Lola gestured her to stay silent.

In a moment everything became clear to Sam. Max had a ballbusting fetish but he was embarrassed about it. His kind sister Lola was just giving him what he wanted trying to not make it obvious. What a lovely sister Sam thought!

"Wow Max!" she said out loud for Derek to listen. "You're a really tough boy! You're really taking it like a man!"

"Lola doesn't hit hard as you did with me!" Derek couldn't keep his tongue still.

Lola glared at him. Sam made a gesture with her head. "Get him girl!" she said.

"Feel free to play with my bongos while i teach Derek how hard i can it!" Lola smirked and walked over Derek.

"No!" Derek balls were still aching from before, he couldn't take one more hit. He tried to flee by moving on his four. Sam bursted out laughing when she saw her brother scared by a girl. Lola leaped on the poor boy and the two of them began a silly wrestling fight on the sand.

Max wasn't at ease with it. He didn't want Lola to hit another boy in the balls. "Wait sis.. You can't..."

"Oh poor boy!" Sam exclaimed. "You don't want your sister to have some fun with another pair of balls!" Max blushed and moved his attention to the girl between his legs.

"Would you let your sister to have her way with my brother if i give you one of my hardest kicks right on your balls?"

Max swallowed. Apparently Sam knew that he was liking it. "But.. I don't... Why should i let you kick me?"

"Cause your dick can't lie! Come on let's shake it and make it happen!"

Max didn't know what to do. "Ok but don't tell Lola... Please!"

"If you don't tell anyone that i like to kick boys in the balls! Deal?" Sam smiled.

"Deal!" Max offered his hand to Sam.

The girl grabbed his balls and shaked them instead. Max laughed at the joke.

A few meters away Lola was still fighting with Derek. It didn't look like she actually wanted to hit his balls. She was laughing and having fun. They were just tickling each other but things changed when Lola saw Max on his knees offering his balls to Sam. She didn't want Derek to see it.

She eventually managed to grab his balls and squeeze them a little. Just enough to give her the upper hand and intimate him to surrendered while Sam was taking care of Max.

"We can still say Lola that you're hard for these!" Sam bended over a little and traced her cleavage. "And tell her that i kicked you for staring at my tits!" Max nodded with his mouth opened, he was almost drooling.

"Yes? Do you like the idea? Then stare at my tits. That's right keep on staring and..."

Sam swinged her right leg behind and in a quick motion kicked Max in the balls while he was still distracted by her boobs. It was a pretty hard kick.

Max was in ecstasy. He groaned in pain but couldn't hold a moan of pleasure. Sam managed to mix the pain and the sexual desire in a way he didn't think it was possible.

Sam was feeling aroused as well. She loved to she how submissive Max, a boy, was! She pushed him on his chest with her foot and forced him to lay down.
She kept her foot there and said out loud "That's what happened when you stare at my tits!"

On the other side Lola was still squeezing Derek's balls. She released him when she noticed that Sam was done with Max and quickly kicked him in the balls one last time.

Derek went on the sand in no time. Lola smiled. It was delightful to see such a big muscled boy on the ground because of something trivial like a kick in the balls. She wasn't aroused like Sam or Max were but she thought that was funny for real.

She placed her foot on Derek's chest in a victory pose and glanced over to Sam who was exactly in the same position.

The girls laughed out loud. Eventually they decided that the boys had had enough for the day and laid down to sunbath.

Max was visibily happy. He chatted with Sam and enjoyed her company. Lola was glad to know that he was having a good time. She'd worked hard to see him happy.

She made some comments about Max looking at Sam's boobs and mocked him for that. Just to be sure that Max was sure that his fetish was still a secret!

"Max you're really lucky!" Sam said. "Trust me your sister loves you!"