Gym Accident Part 3 - Chelsea's Sister

Author’s note: This is part 3 of the series. Here are the links to [part 1](https://www.reddit.com/r/BallbustingStories/comments/1qdnefa/gym_accident/), [part 2](https://www.reddit.com/r/BallbustingStories/comments/1r7rliz/gym_accident_part_2_first_date/), and [all of my stories](https://www.reddit.com/user/korbona69/comments/1o00nqf/all_my_stories_with_links_will_be_updated/). Thanks to u/LeoFalchi for the idea! 



George walked down the hall to Chelsea’s apartment both excited and nervous about what was to come. He was wearing his usual workout gear: sneakers, basketball shorts, and a random old t-shirt for a band he used to like. His balls were still sore from the last two days, but he was almost getting used to it. When he arrived, he saw her and paused for a moment, taking in her beauty. She was so out of his league. For some reason, she was wearing jeans and a t-shirt, not what she normally wore to the gym, but his attention was drawn more to the way her ass fought the confines of her pants to really pay attention to that. Feeling a little mischievous, he hugged her from behind and asked, “Missed me?” 



His arms were wrapped around her waist, pulling her soft ass back into his crotch, and he kissed the back of her head. Suddenly, he realized that her hair seemed longer than usual, down to the middle of her back. She whipped around, breaking out of his loose grip easily, and said, “What the fuck are you doing, you creep?” His heart jumped as he realized - this was not Chelsea. She grabbed his shoulders and her knee flew into his groin, unprotected by the soft shorts he wore, and he crumpled to the ground. Before his hands could move to protect his balls, the woman kicked him again, her boot thudding into his crotch. 



As a cry of pain burst from his mouth, Chelsea ran out the front door, wearing a pink sports bra and tight pink shorts. “Abby, wait!” She yelled. “That’s the guy I was telling you about!” 



Abby gasped. “He surprised me from behind! I thought he was harassing me!” Chelsea knelt besides George’s curled up body, rubbing his back and whispering soothing nonsense. Abby didn’t know what to do, so she just stood there and watched. It only took a couple minutes for the horror to turn into amusement. She had seen it happen before, of course, but she’d never hit a guy down there, and was totally unprepared for this severe reaction. She accidentally let out a giggle and Chelsea glared up at her. 



“Don’t be a bitch,” she said, concerned her new boyfriend was going to become a eunuch. They hadn’t even made the label official yet, but after the previous night there was no way she was going to let him go. Turning her attention back to George, she murmured, “It’s going to be okay, George, I know it hurts, you’ll be alright.” 



The suffering man was just starting to hear her, returning to the present from a world of pain. His balls throbbed with wave after wave of agony. This was even worse than the accidental kick from Chelsea. He was struggling not to throw up, but his stomach was churning. George’s hands were clasped tightly to his groin. It took almost five minutes, but he was finally able to stop writhing and sobbing. He didn’t have any space left in his mind for embarrassment, and he clung to Chelsea’s reassuring hand with one of his own. 



It took a couple more minutes after that for him to be able to struggle to his feet. Chelsea did most of the work of carrying him into her apartment, where he collapsed onto her living room’s rug instead of trying to get all the way onto the couch. 



“Ice!” Chelsea demanded, and Abby ran off to get some while she continued to run her hand through his hair comfortingly. George was flat on his back now, legs wide apart while he cradled his devastated balls with one hand. Abby returned and handed the ice to George, who had managed to open his eyes and focus on the world again. He gingerly placed the bag onto his crotch and wiped his face with his other hand. His eyes were closed as he fought through the agony. 



“George? Are you going to be okay?” Chelsea asked him gently. 



He rasped out a reply with an unsteady voice. “Yeah, I think so.” 



“I’m really sorry, George,” Abby said. Most of the amusement was gone from her, save for that felt by any woman when observing the pain she could never feel. “You just surprised me and I reacted on instinct. I guess those self defense classes came in handy.” 



“Not your fault,” he replied, struggling to form full sentences. “Thought you were Chelsea.” 



Abby frowned. “So you think we all look alike, huh?” 



His eyes flew open and he waved his hands in panicked denial. “No, no! Of course not! You just -” Abby couldn’t keep a straight face anymore and burst out laughing. Beside him, Chelsea did the same. George’s face was already red with the pain but he flushed even deeper. He started to laugh but it turned into a coughing fit.



“This is my sister, Abby,” Chelsea said. “She’s a student and decided to pay me a surprise visit because her class was cancelled. I was just kicking her out for our date when you came across her. Don’t worry baby, I know we look alike.” Side by side, they could have almost passed for twins. Chelsea was definitely more muscular and Abby had longer hair, but they were both beautiful and curvy. 



Abby snorted. “Going to the gym is not a date, Chels. This is why you’ve been single for so long.” 



“Fuck off, Abby, you spent half the day crying about how your girlfriend just cheated on you,” Chelsea replied. 



“Ugh, I wish she was a guy so I could squish her nuts like grapes,” Abby said fiercely, making a grabbing motion. “Anyway, I’m going back to my dorm. Sorry about your testes, George. Hope they’re still working, for Chelsea’s sake.” With a cheerful wave she walked out the door, leaving the new couple alone together. 



“Let me take a look,” Chelsea commanded. George complied, pulling down his pants and exposing himself. She moved down to his crotch and gently lifted his penis out of the way, placing it on his stomach before picking up his even more swollen balls. Somehow, even through the lingering pain, George relaxed a little when he felt her take his manhood into her hands. Despite the pain she could cause - and after last night he knew they both *wanted* her to cause - he felt safe with her. It was hard for him to see her eyes, but she smiled happily. “They’re both still here,” she reported. She leaned over for a kiss and George raised himself up to meet her soft lips. 



Chelsea pulled away, looking softly down at her suffering boyfriend. “I think we should make sure that they still work,” she said. She put a finger to her mouth and looked upwards, pretending to think. “But you did try to cheat on me, with my little sister no less, so I think you deserve some punishment.” Her hand, which had been gently rubbing his balls, tightened slightly. She remembered his recent agony though, and added, “Or we can postpone the punishment if you’re not up to it today.” 



George’s heart beat a little faster at that. She was so hot, and kind, too. His eyes roamed over her body. His cock began to rise at the sight of her exposed skin, her sports bra barely covering her tits. “I deserve to be punished,” he agreed, a little nervous but willing to play along. 



Chelsea smiled again, but this time there was a hint of sadistic lust in her eyes that turned him on even more. “That’s what I thought.” She flicked his right testicle and couldn’t stop a shocked giggle from coming out when he jolted and let out a little cry of pain. Breaking character, she said, “There’s no way that hurt that much!” George clasped his sack with one hand, the other resting on her thigh as she knelt next to him. His expression told her that she had no idea how these fragile organs worked. 



She flicked his thigh, right next to his balls, experimentally. He barely reacted, and was about to ask if she had missed, when she repeated the action on his left testicle and he squeaked in pain again. Shaking her head in wonder at his vulnerability, she laughed again. His dick was standing at attention by now and she flicked it curiously. He didn’t react, but she enjoyed the sight of his cock bouncing around a little and gave it a couple light slaps, which caused him to inhale sharply. 



Chelsea rubbed her pussy from the outside of her shorts for a moment before taking them off. George’s eyes immediately were glued to her pussy, which was glistening with her arousal. Just like the previous night, Chelsea climbed onto his face, but this time she was facing him, so her big firm ass was on his face too. She didn’t have to say anything before George started to lick at her pussy. Chelsea moaned loudly at the feeling of his tongue sliding into her cunt. She released her breasts from the confines of the sports bra and hitched up George’s shirt so her hard nipples rubbed on his stomach as she leaned down. She lightly traced the head of his cock, now leaking precum, with a finger, while her other hand reached past for his balls. She could feel his dick twitch as she grabbed her target, his left ball. 



George’s tongue sped up and he pulled out of her cunt, finding her clit. Licking at it quickly, she barely had time to let go of his testicle - she had nearly crushed them while cumming the night before - before her thighs pressed tight and she screamed out her orgasm. Her whole body shook with waves of pleasure. He paused when her thighs unclamped, but she grabbed his balls again and whispered, “Keep going, George,” in a sultry moan. 



This time, instead of just squeezing it - which was causing far more pain than she realized - she grabbed the base of his scrotum with one hand, forcing his balls out against the bottom of it. With the other, she flicked him again, expecting another mild squeak. However, because they had nowhere to go, his left ball took the full brunt of the attack and he thrashed in agony. His cries of pain were muffled by her pussy, but she realized it was more painful than she thought, and said, “Oops, sorry baby.” She gave his cock a few quick strokes - it was dripping with precum - and when she stopped, he thrust into the air ineffectually, trying to get some stimulation for his penis. The pathetic sight caused her to giggle again and she grabbed his balls once more, marvelling at the fragile orbs in their soft sack. This, along with his continued efforts, brought her to another orgasm. Then she dismounted him, swiveling around to face him once more. 



He couldn’t help but gasp at the sight of her, eyes dark with lust, tits bouncing with each heavy breath. His hands came up to cup them without any conscious thought, and he was amazed at how soft they felt. He almost felt like he would burst right then and there. Her voice brought him back to reality.


“You don’t have any STDs, do you?” She asked. “If you do and don’t tell me, I swear I will turn your family jewels into earrings.” 



“I’m clean,” George replied, more aroused than scared by the threat. “I got tested a few months ago and I haven’t been with anyone else since.” 



“Good, cause I’m on the pill and I want you to fill me up with your cum,” she replied. Her athletic body easily squatted over his cock and with a little maneuvering, the head of his dick was inside her. After taking a second to adjust, she slowly lowered herself the rest of the way, both of them gasping in pleasure at the almost overwhelming sensation. She began riding him hard. Each bounce brought her voluptuous ass down on his balls but the pain just made the pleasure that much better. He sat up to kiss her and their lips met almost violently. Chelsea held him to her with one hand, breasts pressed into his chest, while she played with her clit with the other. 



“I’m close, Chelsea,” George murmured into her mouth. She didn’t reply verbally but sped up, moving even faster. A few seconds later, she came for the third time, scratching his back. The way her walls clenched around him caused George to lose control as well, shooting spurt after spurt of cum deep into her pussy. She milked out every drop, not stopping until his overly sensitive cock started to hurt. He fell back to the floor and she followed him down, lightly kissing the side of his neck while he was still inside her. They didn’t speak for several minutes, breathing deeply and enjoying the intimacy. 



Finally, Chelsea broke the silence. “I - that was so much, I’m fucking exhausted,” she whispered. “Do you want to hang out for the night, maybe get some food delivered?” George nodded and kissed her. 



Suddenly, they heard a key inserted into the lock, and they looked at each other panicked. They didn’t have time to move before Abby came back, saying, “Hey, I forgot my - what the fuck oh my god you’re so gross!” She ran back out the door. 



Chelsea and George looked at each other for a long moment. He didn’t know how to react to this. If it had been his sister, he would have jumped off the roof. Luckily, she burst out laughing, and he followed suit. They quickly got up and he limped to the bathroom. While Chelsea tried to comfort her newly traumatized sister, he put his clothes on. The next few minutes were going to be awkward, but he could see a future with this girl. As his post orgasmic bliss wore off, he could feel the ball ache through his groin and into his stomach. That future was probably going to include freezing his sperm. 



*Thanks for reading! Unless someone comes up with another idea that inspires me, that might be it for George and Chelsea, but I hope you enjoyed their story.*