Jake woke up in his tiny clear plastic cage. His step mother had cut up a few pieces of cloth and made him a pretty comfortable bed. It was larger than a king size bed at his size, so he had to crawl out of it. He put on the makeshift toga that she had given him so he wouldn't have to be naked all the time, and walked over to the thimble in the opposite corner of his container.

He looked at it and sighed. The humiliation of having to use it wasn't as strong as the pressure on his bladder, so he ended up using it. Just as he was finishing up, an ear shattering siren went off, startling him and causing him to fall on his ass.

It was Cindy’s alarm. Her hand reached out and slapped the alarm clock that was next to Jake's cage on her nightstand, silencing it. He heard a few groans come from her as she rolled around in bed before getting up.

His step mom was not a morning person, which was evident by the half asleep shuffle she did across her room to the bathroom before getting into the shower. She had walked right past him without even acknowledging his presence.

A little later, he heard the shower turn off and Cindy walked back into the room, wrapped up in a towel. She walked over to her dresser and picked out some underwear before dropping her towel. Exposing her naked backside to Jake.

Jake couldn't help but stare. His stepmom had pretty wide hips and a well defined butt, from all the time she spent exercising, but at his new size, it was like looking at a planet. She bent over to put on her panties, and her ass seemed to double in size. She finished putting on her panties and bra and went to her closet to pick out a sundress.

After getting fully dressed she left her room and headed out to work. Completely forgetting about Jake.

Jake wasn't really surprised. She had always been pretty forgetful. But now he was trapped here. He tried to scale the wall, but it was much too slick to climb. Defeated, he layed back down in bed and just stared at the ceiling, bored out of his mind.

After what seemed like hours, the bedroom door opened, and in walked Mandy, wearing a tiny bikini. As if to compensate for her lack of assets to cover with a bikini, she wore as small of a bathing suit as possible. The small black triangles were just barely big enough to not be considered a micro bikini top, and her bottoms showed off almost her entire ass cheek.

She walked towards Jake and peered into his container. “Oh, there you are. I thought mom took you with her.”

“No, she completely forgot about me. Didn't even say good morning.” Jake yelled up to her through the lid of his container.

Mandy laughed at that. “Well, she's never been a morning person. Anyways, I'm about to lay out by the pool, want to come with me? Or stay here?”

“I'll go anywhere, just take me out of this thing!” Jake pleaded, excited to finally be freed.

Mandy laughed at that and popped open the top of the container before plucking her step brother out. She carried him in her fist to the back yard where she laid down on a lounge chair and dropped him on her toned stomach, above her belly button.

“Time to soak up some sun.” She said as she put on some sunglasses. But instead of relaxing, she pulled up her phone and started scrolling through social media as she tanned.

Jake just shook his head. “Kids these days, always on their phones.” He joked.

“Oh sush.” she said as she sucked in her stomach and then quickly pushed it out, launching Jake a few feet (to him) into the air and further up her body to land right in front of the string connecting the two triangles of her bikini top. Seeing him fall down made Mandy chuckle a bit before going back to her phone.

Jake groaned and rolled over onto his back. He looked around at his new location on top of his step sister, and scooted over so he could use her bikini string as a head rest.

He laid there for a while, soaking up the sun. He looked around as he lay there, his head twisting side to side as he took in his backyard at his new size. Luckily, Mandy didn't have any breasts to block his view, so he was able to see the great walls that were his fence on either side of him. They appeared to be miles away, and would take him many hours to get to. Not that he had any desire to go visit his neighbors. 

Suddenly he was hit by a big splash of salty water. He sat up spitting and wiping it out of his eyes. He looked up, expecting to see a rain cloud, but the sky was clear. He looked around and realized it was a bead of his stepsister’s sweat. 

“Hey!” He yelled. “You're sweating all over me.

He looked at Mandy's face, but she was ignoring him as she tapped away on her phone. Jake growled to himself and got up to march towards her. He walked a few feet up her sternum, and stomped his feet on her chest to get her attention. “Hey!” He yelled again.

“What?” Mandy said, turning to look at him. “Oh, ouch. What did you do? My chest is sore now.”

Jake thought she was mocking him, making fun of how weak his stomps were now. So he stomped again, as hard as he could.

“Oww, stop that. Why does that hurt so much? My chest feels so tender.” She said as she set down her phone and put her hands on her chest, on either side of Jake.

Jake realized she wasn't mocking him, and that she really was hurting for some reason. He looked at the ground around him, trying to see if she had maybe been bit by a bug or something.

“Mmmm” Mandy moaned suddenly. “What is happening?”

Jake looked around and realized the ground around him was changing. On either side of him, his step sister's chest was starting to rise up.

“Oh god! My tits are growing!” Mandy said excitedly, still cupping each breast in her hand as they started to fill out.

The small hills continued to grow on either side of Jake, slowly going from slight bumps, to taller than him. But they didnt stop. They continued to grow and grow, casting a shadow over him.

Mandy moaned again as her bikini top strained against her growing tits before it came untied and they burst free. She couldn't help but massage her breasts as they grew. This was a completely new sensation to her. She moved them around playfully with a big smile on her face.

Jake was caught up in his step sisters tit play, smushed between the sweaty mountains of flesh. He fought against them, but was powerless as he was jiggled and squished.

As they grew, Mandy's smile started to fade. “Ok, that's enough. You can stop now.” She told her tits. They were now much bigger than a handful for her, but continued to grow. She started to get worried that they would never stop.

Just as she was starting to panic, she suddenly stopped. Their final size seemed to put each breasts at a size slightly larger than her head. She stood up, cradling her new tits in her arms as she ran inside to look at herself in her bedroom mirror.

She looked at her new reflection with awe. Just this morning she had looked at her body in the mirror and was disappointed by how childish she looked. But now she was basically a sex goddess. Her enormous tits stood proudly on her chest, seemingly defying gravity. Her small pink nipples had grown slightly, to look perfectly proportional to her new tits. Luckily, the rest of her didn't gain any size, so her waist was still tiny and toned, which made the size of her tits much more noticable.

“Wow, I'm so sexy.” She said as she played with her new boobs. They were so sensitive, she was starting to get turned on just by touching them.

She was snapped out of her boob hypnosis by a muffled screaming. “Oh shit.” She said, and fished her step brother out from between her tits. He looked like he had just finished a boxing match. Covered in sweat, utterly exhausted, and hair disheveled. “Sorry about that bro. I kinda got distracted.”

She dropped her exhausted brother on the dresser in front of her and went back to admiring herself in the mirror. She decided to see what she looked like now in clothes, and opened up her drawer to get dressed. She didn't even try to put on one of her old bras, and instead just grabbed some shirts to try on.

First was a white t-shirt. She got it over her head, but when she tried to stretch it over her boobs, it didn't even reach down to her nipples. She sighed and moved on to the next item. She tried on several shirts, but they all had the same problem.

Her only option seemed to be a halter top. It barely made it around her chest, but seriously compressing them. A very generous amount of cleavage was on display, as well as an obscene amount of underboob. Deciding that was the best she was gonna get, she grabbed Jake, who had been complaining about something, but she had ignored him and brought him down to the kitchen table where she sat down and placed him in front of her. But as she leaned forward to talk to him, she ran into a problem she never had before. Her boobs were colliding with the side of the table, making it uncomfortable to sit close. Her solution to this was to scoop her tits up and set them down on the table in front of her.

Jake was already in a bad mood from his battle with mount tit, and Mandy ignoring him as she put on an x rated fashion show. Although, he couldnt help but admit how erotic her new body was. He was always a boob guy, so he couldn't help but stare.

After she set him down on the kitchen table, he got ready to tell her off, when suddenly she picked up her tits and dropped them down in front of him. They sent a violent gust of wind towards him, blowing him over.

Mandy burst out laughing at seeing the wind from her boob drop knock him over. “Sorry big bro, still not used to my new assets.”

“Mandy! You could have crushed me! Again!” Jake scolded the giantess. “You've had these tits for like 10 minutes, and you almost killed me with them multiple times!”

Mandy couldn't help but continue to caress her tits as Jake yelled at her. “Sorry bro, its hard to handle these weapons.”

“Stop playing with your tits, you pervert!” Jake yelled at her.

“Im the pervert? You were the one hiding between your little step sisters tits.” She said with a grin.

“I was not! You trapped me in there!” He argued back.

She smiled down at him and plucked him up again, dangling him in front of her. “Ooo Im so sorry. Did your little sister hurt you? Let me kiss you and make it better.” She teased as she puckered up and planted a big wet kiss on him.

Jake tried to fight off her lips, but once again had to suffer a kiss from a giantess. When she pulled him away from her lips, he screamed at her. “Let me go!”

“Ok!” She said cheerily. But instead of setting him down, she just let him fall. He screamed as he plummeted towards her tits. He landed head first into her cleavage. The tight halter top pushed her boobs together with enough pressure to prevent him from sliding all the way through. Instead, he got stuck halfway, his legs kicking wildly in the air.

Mandy laughed hysterically at him. His tiny little legs kicked around as he tried to free himself. Her laughter stopped as she realized the little toga he was wearing had flipped up, exposing his junk. Normally it would be too small for her to really notice, but she saw that it was fully erect and sticking straight out.

She grinned at the site of it. She couldn't blame him for being turned on. She was so sexy now it was almost unfair.

Seeing his little legs kicking, and his tiny little erection gave her an overwhelming feeling of just how cute her step brother was now. She loved teasing him, but she suddenly had an overwhelming feeling of something. It made her feel like she just wanted to protect him and care for him. To keep him safely cradled in her bosom forever. It felt what she imagined a mother feels towards her new baby.

She cooed over his tiny body as she pushed the rest of his body into her cleavage, and then used her finger to flip him around and push just his head free so he could breath.

“There you go, nice and snug.” She said as she used her pinky finger to pet his hair.