Launch was a bit hard to live with, and had been ever since Goku and Krillin brought her in. Roshi loved her, but of course he was did. The barest hint of an opportunity to see her naked was worth more than any number of bullets being fired at him. Then again, Launch didn't help matters by only being kill crazy half the time.
Goku and Krillin loved her blue haired self, as she was kind and caring, a good cook and teacher, she was practically like a mother to them. Thankfully, blue haired Launch seemed to be her base form, the default that she usually was. But one sneeze, regardless of what caused it, and everyone had to flee or risk death by so many bullets, suffocation was more likely to kill you than blood loss.
They weren't really sure what caused Launch to turn into a killer gun toting psychopath whenever she sneezed. For awhile, they had simply gone along with the idea that she just had a split personality. But the change wasn't just mental, it was physical to. Her body became twice as strong and durable, she gained the power to summon fire arms from the ether, and her hair turned in an instant from blue to bright blonde. Even her voice changed.
It was quite clear that she had some sort of super power, one that was highly out of control. If they could find some way to help her control it, she could've started training with them, maybe entered in the tournament herself. The issue was, trying to figure out her powers left those that tried with more bullet wounds than answers.
So everyone just resigned to live with the explosive change between Launch's two forms. Over the eight months of their training, Roshi, Krillin, and Goku got so used to fleeing from the scene whenever they heard a sneeze that they embarrassed themselves by fleeing from a location when some random person or even just one of themselves sneezed. It was terrible for their stress levels.
Goku seemed to handle it better than the others though, which was hardly a surprise by any account. Goku didn't even need to tap into his ki energy to become bullet proof, his skin just naturally soaked it up. It still hurt him mind, but no more so than a barrage of BB gun bullets.
When the time to leave for the world martial arts tournament started to draw closer, Goku decided to repay her the day before they were to leave. He waited until after his extra training with Krillin and Roshi so they would both be asleep, then went into Launch's room, waking her carefully so she didn't sneeze.
She woke with a yawn and sat up with her legs over the side of the bed, "Goku? What is it dear?" She asked kindly. "We're gonna be leaving tomorrow," He said, "And I'm not really sure where I'll be going after that. I wanted to say thank you before we leave."
Launch smiled, "Oh you didn't have to do that." Goku smiled, "I wanted to. My friend Bulma showed me a good way to." "What's that?" Launch asked curiously. "Close your eyes." Goku instructed.
Launch closed her eyes, and Goku moved fast, removing the pajama bottoms she slept in and pushing her legs apart. Even as slow to the punch as Launch was, she figured out what was happening pretty quick. Not quick enough to actually stop Goku before he got his tongue inside of her pussy mind you.
Launch moaned, "G-Goku, y-you shouldn't do that." Goku ignored this, pushing his tongue deeper into her. It had been awhile since he has had Bulma to practice on, and so he was worried he would have lost his touch, but sure enough, Launch was moaning louder and getting wetter in moments.
Goku pushed his tongue as deep as it would go, swirling through her folds in search of a sweet spot. His fingers found and rubbed her clit as her legs locked around his head in pleasure, too far in now to resist it.
Goku found a sensitive spot and attacked it with his tongue, grinding his thumb into her clit hard. Launch tensed up, groaning as she came, drenching Goku's face in her juices. Launch panted as Goku licked his lips, "G..Goku that was...great.." Goku smiled, "You taste pretty good."
Launch giggled, but unfortunately she then did what she did when almost anything happened to her body: she sneezed. Goku started to back away as the blonde hair appeared, but was frozen by the realization that her hair wasn't the only part of her that changed, and where her pussy had been, there was now a massive, stiff cock and a pair of balls to boot. She was still extremely feminine, and Goku realized that while blue Launch was a female, blonde Launch was a D-girl, the inverse of a C-boy.
She glared cruelly down at him, but there was something unsettling about the look, like hunger. "You wanna play with me huh? Alright, let's play!" She shouted, pushing his head back down and thrusting her twelve inch member into his throat.
Goku gagged at the sudden intrusion of his throat, but Launch didn't let up, thrusting harder into him, skull-fucking him with loud moans of pleasure. Goku tried to help her cum, hoping that would satisfy her. His hands went up to her balls, gently holding and fondling them as he sucked hard on her member.
Launch moaned, fucking his throat harder for another two minutes before cumming, filling his throat with hot, thick seed. Goku coughed slightly, not having expected the amount that would come out. He pulled back from Launch, only to be thrown to the ground as she pounced on him, lining up to his pussy and thrusting in hard.
Goku cried out, Launch moaning in bliss, "Fuck yes~! Take it you whore!" Launch growled lustfully, drilling his cunt aggressively and forcing her cock deeper and deeper into him until she was balls deep inside, her entire length slamming into him with each thrust.
Goku could only imagine how long it had last been since blonde Launch actually had the opportunity to fuck something, and she came after only ten minutes of railing Goku's tight pussy, unloading a massive flood of thick, hot cum into his cunt, causing his back to arch as he cried out again, this time in pleasure as he came, collapsing on the ground beneath Launch, who held onto him tightly as they both drifted off into unconsciousness.