"Awe, pretty please Bulma. We have to start training again so we can get stronger." Goku whined, after being told by Bulma that he and Vegeta were not allowed to go back to Lord Beerus's world for training.
"No, the last time you left Earth. Frezia attacked, and we almost died." Bulma stated, making her case that they should continue their training on Earth.
"Relax, we can always have Kararot teleport us back here." Vegeta said, rationalizing why they should be allowed to leave.
"Yeah, but last time it took all of Gohan's energy just to reach you." Bulma countered, waving her fist at the two Saiyans.
"Whatever, call Whis to Earth. We'll be leaving tomorrow. " Vegeta replied, leaving with Goku to go spare in preparation to continue their training.
"What's wrong with those two? I mean, aren't they strong enough? If only I had a way to make them listen to me." Bulma said to herself, forming an idea in the back of her mind. There was an invention she could use that would make Goku and Vegeta listen to her. One she built many years ago when she was only 16. Of course, she'd have to make a few adjustments first before it was ready to be used on Goku and Vegeta.
"If I make the necessary modifications, then that could work." Bulma told herself, though she couldn't even remember the last time she used it or where it was. The blue haired woman then proceeded towards her lab, preparing for a full night of technological experimentation.
---The Next Day---
Goku and Vegeta were waiting impatiently for Bulma and Whis to arrive, standing out on the Capsule Corp Building's lawn. Goku was excited for any excuse to get back to his training so he could make himself stronger, while Vegeta was determined not to allow his longtime rival to advance ahead of him again.
Meanwhile, Bulma was hiding around the curved corner of the Capsule Corp sphere building. She looked at her wrist, adjusting the setting on her new and improved version of the microband. Once, when she first set off on her journey to find the seven Dragonballs nearly 30 years ago, Bulma used this device to shrink herself down to 5 inches tall. However, thanks to some improvements she's made not only can Bulma use the watch to shrink others, but she can also control the size to make them much smaller.
She hadn't run any human or Saiyan tests for that matter, just shrinking boxes and machinery in her lab. Luckily, she had two test subjects close by that she could experiment on. Bulma peeked around the corner, adjusting the device for distance and the size she wanted Goku and Vegeta to become. Just under half an inch tall should be about the right size for her to control them, they were still powerful fighters and could prove troublesome at a larger measurement.
Bulma double checked her wrists and clicked the button that would bring Goku and Vegeta down to size, literally. Within moments Bulma found herself watching in awe as the two alien warriors shrunk before her very eyes. Losing half their height each in the blink of an eye, now they were not taller than Trunks or Goten. But their shrinking didn't stop there, not by a long shot.
"Vegeta, what's going on?" Goku asked as the world around them grow several times over in size, their surroundings becoming gigantic in comparison to their shrinking bodies.
"Kakarot, what have you done?" Vegeta asked, just as confused as Goku for once. Blaming his longtime rival for this turn of events.
The pair of Saiyans continued shrinking in size until they heads were well below the grass line of the Capsule Corporation's front lawn. Now they were as tiny as ants compared to someone like Bulma, slinking around the corner as the two finished shrinking.
Boom, Boom, Boom, Boom!
The tiny Saiyans began too feel strong vibrations, moving through the earth beneath their feet. Each one more powerful than the last, something or someone was coming. "Kakarot, do you feel that?" Vegeta asked, taking a fighting stance with Goku back to back. "Yeah, feels like footsteps." Goku answered, their warrior instincts taking over and assuming they'd been shrunk by a new enemy. However, nothing could prepare them for what came next.
Boom, BOom, BOOm, BOOM!
The vibrations continued to get even stronger, just how massive was this opponent they were supposed to do battle with? A large shadow presents itself over their bodies, casting itself over them a mile long. The two were awestruck, unable to move a muscle as they looked up to see an 850-foot tall Bulma towering overhead.
"Hey boys, I hope your ready for some special training." Bulma teased, feeling as if she were talking down to bugs now that she'd made them so tiny. The same was true for them, though they didn't exactly see Bulma as a bug, more like a goddess 3 times taller than Shenron himself.
"Bulma! What is the meaning of this?" Vegeta asked, pulling himself together after coming to terms with the new size difference between him and his wife. Meanwhile Goku just stood there saying nothing.
Bulma bent down to get a closer look at Goku and Vegeta, almost losing them in the grass at her full height. "Well, I couldn't let you two leave to go to Lord Beerus's world, and since you wouldn't listen to reason I decided to take matter's into my own hands." Bulma said confidently, reaching down to scoop Goku and Vegeta up.
Bulma's hand hit the ground dragging along the dirt, nearly knocking the tiny pair off their feet as she picked them up in the palm of her hand. She lifted them up to about chest level, keeping them just under her now massive breasts, each about equal in size to the Capsule Corp building.
"Wait, so we're not gonna be able to train?" Goku asked, not seeming to bother by the fact that Bulma shrunk them and having one track mind towards getting stronger.
"Of course you can still train, that's why I shrunk you. You'll just have to get used to training under me instead of Whis." Bulma teased, winking at the micro Saiyans.
"And just what do you know about fighting?" Vegeta asks, skeptical about being trained by someone who's never been in an actual fight herself.
"Lots actually, I've been watching Goku for almost thirty years. I can think of more than a few ways to train you that are almost guaranteed to make you stronger." Bulma says back. Vegeta however, wasn't buying it, him and Goku both have reached Super Saiyan Blu and attained the power of the gods. What could a human woman like Bulma possibly teach them?
What kind of training does Bulma have in store for them first?
1. Bulma suggests that she put Vegeta's worries to rest with a sparring match, confident that she'll come out as the winner she offers a scenario where the one who performs best gets a reward, while the one who performs worst gets punished.
2. Bulma takes off her boots and drops one of the shrunken Saiyans in each, telling them that their first task is to endure the rest of the day living under her full weight.
3.Bulma brings Goku and Vegeta inside where she reveals that by shrinking them, she's neutralized their ability to go Super Saiyan. Placing them on a seat(Chair, couch, ect...) She tells them she wants to see if they can hold her over their heads while she sits on top of them. Can they handle it? Probably not.