*Goku has achieved the Super Saiyan transformation! But this leaves Vegeta in the dust and highly frustrated about it. The younger Saiyan, however, who has long lusted after the little Prince, gets an idea that may get them both what they want...*
"You- Y- You- You what!?" Vegeta sputtered, staggering back away from Goku. This pinned him to a wall, which did not help the situation at all. "You've lost your fucking mind if you think I'd ever-!"
"It's the only way," Goku whined. "I wish there was another way to do it, but if ya don't do it like this, it might not happen at all." He couldn't believe this. Vegeta seemed totally convinced (although horrified) that what he'd said about him achieving Super Saiyan was true. "And even then, it might take a couple tries. It's the fastest way to get a transfer of energy and the ability itself."
Vegeta's face was as red as a cherry. Goku was almost on the floor howling with laughter. Who would have thought that the brash and shameless Prince of all Saiyans would be... so shy? "You've lost your mind..." he almost whimpered.
"Hey, it's totally your choice," Goku said, raising his hands defensively. "Ya don't have to. I'm just saying it'd be a hell of a lot easier than maybe waiting ten or fifteen years to try to get it." The fact that Vegeta hadn't straight forward denied him was hopeful. "I get how ya feel about it. Not my first option either. Do what ya want, I'm just trying to help."
Vegeta looked down at his feet, still blushing furiously. "Are you serious, Kakarrot?" he whispered. "Having... Having sex with you will help me transform...?"
"That's what King Kai said, and he knows a lot about the Saiyans," Goku replied, managing to pull off the whitest lie he'd ever told. It almost hurt to do so, but he needed this to happen. He needed Vegeta... and maybe if he was lucky, the experience might actually help Vegeta transform! "Look, I know it sounds crazy and dumb and..." He sighed, glancing away. "I... I want to help ya do this, Vegeta."
Vegeta stared at him like a scared and frightened kitten. He looked adorable, struggling between his lust for power and his pride. He shifted his eyes down in despair, then up seemingly in a silent, two second prayer. "Fine," he whispered, just loud enough for Goku to catch. "Fine. But- But this means nothing, Kakarrot. Nothing between us at all."
Goku nodded. "Ok. Nothing that ya don't want."
Vegeta looked at him, studying him carefully for a moment. "What are you implying?" he asked suspiciously, narrowing his eyes. "Kakarrot, be honest with me. Do you have feelings for me? Is this the reason you're so willing to do this? Are you doing this for your own gain as well?"
Goku squeezed his eyes shut. "I won't lie, Vegeta," he said, braving the opportunity to open one eye partially. "I do. I've liked ya for a long time now. But this really is a way to do it, and I do wanna help ya!"
"I believe you," Vegeta murmured, and Goku could see that he was trembling. "Kakarrot... come here." He shakily extended a hand to Goku. When Goku blinked in surprise and came forward, Vegeta manipulated Goku's hands to his waist with a sigh. "Let's get this done and over with."
"Vegeta-"
"Shut up!" Vegeta growled, his eyes not once meeting Goku's.
Goku hesitated, then shook his head, pulling his hands away from Vegeta's warmth. "No. I can't. Not like this." His eyes teared up and he looked away. "I can't do this if you don't wa-"
Vegeta surged forward. His hands caught Goku's and he slammed him to the wall. He looked Goku in the eye, red-faced and shaking. "Tch... B- Baka... Du bist blind. Du bist immer blind." His lip trembled. Goku looked baffled by the strange language. "You're blind, Kakarrot," he hissed, a single tear managing to escape. "How haven't you seen it? I- We- My body was made for you. What we're feeling is instinct. But it's so, so real." He looked down. "I... want this. I want this too. Don't-" He half choked on a breath. "Don't make me beg."
Goku nodded, hoping he didn't look as terrified as he felt. He'd never seen Vegeta like this. It was so out of character. "Ok..." He flexed his hands when Vegeta released them. The little Prince landed and took a few steps back. Goku reached out and brushed his tear away. Vegeta glanced up at him with a bitter need. Goku hated the expression, but he drew Vegeta close to him anyway and buried his face into Vegeta's neck, kissing him softly as his ki burst to life and his hair turned gold and his eyes blue. "This is for you," he whispered to him. "I'm doing this for you."
Vegeta eased into his warmth. His stomach churned, and something in him felt nauseated by being this close to the other Saiyan, but his lust for power and the need for another of his kind was more than he knew how to fight. So he let Goku touch him, let Goku whisper gently, lovingly in his ear, let Goku push him against the wall, let Goku pull him to the bed, let Goku feel him in ways he'd never let anyone touch him of his own will, let Goku inside him, let Goku hear everything he couldn't say without being intoxicated by this lust, let Goku destroy him inside and out, let Goku fill him with his essence, his ki, his energy, his power-
Vegeta gasped wildly, half unconscious and convulsing slightly. His eyes were filled with light, and he distantly wondered if he was dead. But he heard Goku pant his name. So he wasn't dead. He summoned enough strength to sit up, and did so just in time to see Goku fall back to his base form. But still the golden light around them did not fade. He got up, staggering to the other side of the room. But he halted halfway there. He could see his reflection, burning with golden flames.
Goku chuckled. "Told ya."
Vegeta couldn't tear his eyes away from the mirror. He slowly ran his hand through his hair. He wasn't dreaming. He stared into astonished blue eyes and touched soft, golden hair. He scoffed, almost disbelievingly. "How...? I... Kakarrot, I-"
"You look beautiful," Goku murmured, sitting up. He joined Vegeta and rested both hands on his shoulders. "Are you happy?"
Vegeta turned to face Goku, then stood on tiptoes to kiss him lightly. "Yes," he whispered.
*This and so many others are due. >.< I apologize for the horrible lack of updates!*

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Goku X Vegeta Oneshots
FanfictionA big ol' book of awesome Kakavege goodness. A hundred chapters and going!