Kevin was unexpectedly pushed into the pool by his two older brothers. He was pushed back first so when he fell into the deep water his limbs were held out in front of him. His legs were the last to enter the water. He was sinking rapidly and had began to shake around, the gap in his swimming shorts and his thigh caused you to float out! You completely lost track of Kevin and there was nothing in the surrounding area. You looked all around and finally saw Kevin, he had just hit the bottom of the pool and was now trying to swim back up. You looked up and suddenly noticed the surface getting darker. You realized someone else was entering the water! You quickly swam to your left, you saw bubbles, indicating that whoever it was, had entered the water! You had very little time to react but you looked up and realized your attempts were useless, the boy was way to large for you swim out of the way in time. Luckily though, the boy's gaping leg hole from his swim shorts and knee (his leg was bent back so that his foot was near his rear end) were directly above you, you remained still and suddenly you were surrounded by the dark fabric of his swimming shorts. His inner thigh had just passed you and now his descending crotch was headed right for you! You didn't know which side was heading for you but you would find out soon, either his butt or his sack would be smashing into you very soon!
You were hit by very malleable skin, indicating that the boy's nutsack was the thing slamming into you. Finally the boy reached the bottom and swam back up to the surface. The boy reached the edge of the pool and climbed out, he had decided he would dry off for a few minutes and then go to the bathroom. You heard another voice, as the boy was walking to a chair, the voice said " hey Jimmy, good job, we'll get Kevin again!" And you heard your host's voice say "yup, I'm going to dry off for about 5 minutes and then I'm going to the bathroom" and the other voice said "alright."
Jimmy, your host's name, sat down on a chair in the sun, letting the warm sun dry him off. His large nuts were much heavier, and larger than Kevin's, they even had some hair. They were warm and soft, you wanted to try and see if you could go inside of one. You played with the warm musky orbs encasing yourself in their skin. You climbed up to his large member head, careful not to arouse the beast, you weren't sure if he had reached that part if puberty yet, he seemed to be about 11. You reached his member, you put your arms and head inside the tight slit you pulled yourself all the way in when you felt him standing up! The boy's walking made his rod bounce around which in turn made you jiggle around inside his member. The boy felt this and stopped for a second and then continued, sort of confused. You reached the sphincter that led to his balls but you couldn't pry it open with your hand so you flipped around so that your legs could kick it open. Jimmy noticed all the urinals were in use so he went to an empty stall and pulled his short off and sat down. You felt his rod bounce and you looked ahead and you saw through his now open slit a toilet bowl! Alarmed you fiercely rubbed the inside of his penis making it erect slightly, enough to where it would be hard to pee but not enough so that he would be very aroused. This made it easier for his sphincter to open up, and you slid in, it was extremely tight and you caused Jimmy to start groaning. you felt a little bad so you shrunk yourself just a little bit smaller. You continued through his prostate and you felt and heard Jimmy moan to himself, you exited this extremely sensitive area and You continued sliding down his vas deferens until you reached his reached his epididymis.
You successfully entered his nutsack! The next time you'll be able to leave is when he ejaculates! You laid in a pool of sperm and suddenly you felt everything shaking! He was shaking his balls, you hoped you hadn't aroused him too much! He began to squeeze his balls, particularly the one you were in, he could feel you you thought! He began smushing you with his fingers but after a while he stopped.
On the outside, Jimmy wondered if this meant he could do the stuff he learned in school and what his brother told him about the other day? He tried but he found it too gross so he stopped and waited for his dick to get smaller so he could finish his business. After finishing his business he headed back outside and jumped into the cold pool with his brother. He dove down deep into the cold water touched the bottom and quickly swam up to the surface. He and his brother played water tag and hide and seek in the pool, he found a spot where there was a little waterfall and he hid behind it. The cool water hit his face, it felt good after the bleating sun had beat down on him all day. He leaned his head back so it wasn't getting splashed anymore, and the freezing water hit his balls! It was way too cold for him to handle! He scooted back and accidentally bonked his head on the wall. He heard laughing and when he looked up he saw his brother who told him he saw it all. The two of them decided to go bother Kevin. And they went into a sauna.
Inside the young boy's left ball was you, enjoying the warmth when suddenly it got very cold as he jumped inside the freezing water. His loose hanging balls very quickly constricted and tightened to the boy's crotch so some of the warmth would stay. About 10 minutes later a wave of extreme coldness hit you directly in the face and apparently shook jimmy as you heard him soon say "ow!" Later, it got very very hot, you felt as if you might pass out you decided to dive deeper into the boy's epididymis, the milky liquid was flowing all around you. You hit a sweet spot in the fleshy maze, sperm flowed through a little Opening to be stored, and the air was cool but the walls were warm and thick enough so a faint light came through the walls. You cupped your hands to drink some of the sperm. It tasted surprisingly sweet it also tasted a little powerful. You knew the boy had never ejaculated, he wasn't old enough and didn't have the mindset, however, he has an enormous amount of sperm that was matured and millions were being created per minute. If you ever wanted wanted to escape you would have to wait until he ejaculates, try to force him to masturbate, or try to tediously climb out of the slick and tight tubes yourself. However you're completely content being here in his large ball, you decided you would explore his nutsack in the meantime. You done into the liquid and began masturbating yourself, and shot your seed inside of his! You also realized you could potentially control this boy by arousing him.
Kevin, Jimmy and the eldest brother were sitting on chairs relaxing in the warm sun. You decided to test your hypothesis, and began massaging the slick, warm walls. Jimmy begins to grunt under his breath, he started shifting slightly and then he shot up and headed to the restroom real quick. He immediately went to a stall and sat down. You continued and you heard the young boy whisper to himself " stop! I'm trying to relax!" You continued and you heard his blood begin to pump harder, you heard a few groans and grunts, and suddenly your whole room began to shake violently! You swam up top of the tube and the sphincter to get inside was still sealed tightly. The shaking began to stop so you started rubbing the sphincter which caused the shaking to resume!
On the outside jimmy felt odd, so he began shaking his weighty sack, he observed as his sack shook back and forth between his legs in the toilet. The odd feeling went away so he stopped but then It came back so he continued. Once it stopped he said aloud " I'm not going to touch them anymore, I hope they stop feeling weird." You heard him say this and giggled to yourself. He dropped his weighty balls and then he went back outside.
You decide that you are going to
1) wait until he lets you out naturally
Or
2) escape using your own means