Okeydokey. Here we go.
 

        He hadn't really been surprised.  His expectations still did not
prepare him for the awful truth, though.  His son was not a Saiyajin.

Bulma cheated?
 

        When he reached the panel, he proceeded to 

shut off the gravity control

mechanism, returning the weight in the room to its normal status.  He
sighed as the strain on his muscles decreased.  But the emptiness
persisted making relief that usually followed, impossible.  As he walked

Might want to add an article, namely 'the' before relief. 

        The faint glimmer of hope had left as fast as it had come.  It had been
foolish of him to expect otherwise from his son.  Second transformation
or not, Trunks was still Trunks; half-human.

Well. Them's the breaks.
 
 

        To think Kakaroto's son, Gohan, born of peasant stock could be more of
a Saiyajin than his own son.  It still jarred Vejita to this day that
Gohan chose to be a scholar.  Though the boy did not like fighting,
anyone that saw the boy transform in the battle against Cell could not
deny the fact that what they saw was a Saiyajin warrior in his full
fury.  A waste of potential that Trunks would never have.  That thought
brought him back to his previous battle with Trunks.

Vegita is the quitessence of Sayajin appearently. Interesting guy.
Nicely done.

        Vejita brought both of his arms down hard on to his son's back,
speeding the body's downward plunge.  *That should do it,* Vejita
thought as the hard metal floor dented at the impact.  He could already
feel the telltale signs of power rising at a drastic rate even though
Trunks lay prone on the ground.

Ah. Father son beatings. Nothing like them.
 

        Vejita was not fooled by the stillness however and soon, just as he
thought, the body disappeared.  *Up there,* he predicted as he fired a
ki blast over top of him.  He was surprised as he saw the touch of gold
in the color of the hair out from the corner of his eye.  *Already?*

He thought that should do it with his previous hit. Why is he surprised
now?
 

        The ki blast slammed into Trunks, but he didn't bat an eye as he
disappeared once again.  Vejita was not prepared for the second time
Trunks vanished and was thus caught unawares as his son materialized
right in front of him.  He had not been mistaken.  The boy's hair now
stood up even straighter than previously and the color was definitely
golden.  There was blankness in the eyes that indicated Trunks had lost
all sense of what was going on as rage clouded his mind.  Vejita had
done it.  He had helped Trunks reached the next level.  And now, he was
going to be in a world of hurt.

This is going to hurt me boy, a whole lot more than it's going to hurt
you. 
 
 

        Vejita looked up to see Trunks hovering above him as he shook off the
bout of dizziness that had overcome him.  A large ball of ki formed in
the boy's hands.  Vejita quickly formed ki blast in response in hopes of
being able to deflect most of the damage.  Then all of a sudden, a light
of sanity appeared in the boy's eyes, and just as quickly as the
transformation took place, Trunks de-powered and fell limply out of the
sky.

Well, that was quick. And here I was expecting an epic battle. 
 

        Vejita's emotional high also deflated as he held out his arms and
caught his son's body before it hit the ground.  He could hear his son
muttering 'father' just before he lost all consciousness.

Bet that caught Vegita by surprise. 
 

        Trunks had reached the next stage in his development and would probably
be able to do it again without any help.  But to Vejita it mattered
little without the soul behind it.  Trunks had once again proved that
despite being able to transform, ultimately, his human side ruled over
his soul.  However, even with all this on his mind, there was one other
thought that bothered Vejita more than his son's failure as a Saiyajin.
It was something he felt when he heard Trunks whisper 'father'.  Relief.

His problem isn't he's human. I know plenty of human's with enough
bloodlust to make and Sayajin proud. He just doesn't have the killer
instinct. Of course, I can see this 'weakness' being attributed to his
human side. 

        Why the hell had he been relieved that Trunks never landed a blow?  He
wanted Trunks to strike him, didn't he?  Finding no answers to that
question, he stalked out of the room intent on clearing his mind the
only way he knew how.  Time to wake Kakaroto up.

Good question.

        Vejita grunted in answer.  Kakaroto had managed to irk him again in a
span of less than a minute.  His abilities must have improved
drastically for him to be able to penetrate the gravity room's barrier.
*I knew it, he had been holding back against me recently.  I'll just
have to force his hand later tonight,* Vejita thought to himself.

Well. Appearently we'll never find these boys chanting 'Violence is not
the answer.'
  

        Vejita grunted again before replying.  "No, the boy just needed a
little help to reach the second level.  I gave Ranma the day off while I
took care of business with Trunks."  Little was spoken between the two
men as they quickly and efficiently polished every item on the table.

Go figure.
 

        "More like she's gotten more money and hired better help," Vejita
said.  He caught himself glancing to the door of the kitchen, looking if
anyone might have been listening in on them.  He shook his head and
wondered if his fellow Saiyajin were laughing at him from hell.

Don't worry. They are. 
 

        "So."

        "So."

        "Full?"

        "Yep, you?"

        "Yep."

        Without another word the two men got up and decided to find someplace
relatively uninhabited.

Another incredibly accurate piece of dialogue and characterization. 
 

                        * * * * *

        Trunks managed to stay upright as he groggily walked to the kitchen,
for once glad that he hadn't woken up in the tank that smelled so much
like medicine after one of a fight with his overly aggressive father.

try 'one of the fights with-' or something else. one of a fight is an
agreement error.

        Ranma shrugged.  "He may be slow and fat and getting on in the years
and dimwitted and..."

Gee. Ranma's filial piety at it's peak.
  
 

        Ranma was already on his feet as the telltale signs of battle aura
manifested themselves.  Life was decidedly easier since he managed to
pinpoint with accuracy how much battle aura a girl had.  He noticed
Trunks motioning him to the doorway as the two girls argued.

Yes Ranma. You have the same effect on alien women too.

        "Ack, and I thought I left all that back in Nerima."

I think Ranma would not be surprised when both Bra and Pan are after
him. After all, he's Ranma, the great Ranma. 

        "You don't sound like you get along with your father that well.  If it
were me, I don't think I would mind him paying that much attention to
me."  *I would love it,* Trunks thought to himself.  "It must be great
to have him train you for the past ten years."

Trunks under the power of the Neko-ken. I shudder to think. 
 

        "Ranma, enough training.  Time to show me what you've learned."

And thus the greatest speed eating contest ever was joined.
 

        Ranma blocked the first fist that was aimed at his face, but was not
fast enough to block the leg that swept him off his feet.  His head rang
as his head was swatted to the side by his father's huge hands. 

Don't repeat head so close together. Use a pronoun.

        "What are you doing, Ranma?  You could have hit me there instead of
trying to run away.  

I'd use flee instead. You used 'run away' the sentence before.

        Ranma tried looking down at his hand which was still clenched in a
fist, but could only see a blurred shape.  He had done it.  He had
punched his father.

Ah. Dreams attained.
 

        "Good job, boy.  You made your father proud.  We'll do some more
sparring later.  Don't worry, you'll get use to it."

        *Get used to hitting Pop?  I didn't like it when I got angry at him.*

I think, given Ranma's character, even at the tender age of six he'd
feel proud. Besides, his father told him he did something right. That
young, paternal praise is mana from heaven, especially from a father
like Genma.
  

        "I don't know about that.  Pop never asked me what I wanted.  Well if
he asked me now, I'd probably have told him to do what he did to train
me.  But if asked me earlier when I was young... well then, I don't know
anymore," Ranma said thoughtfully.

Say what you will about Genma, the man can really teach one too fight.

        "I don't.  Thinking's not my thing," Ranma grinned.  He pointed to his
fist.  "This is.  So, you up for that sparring contest now?"

        "Always," Trunks grinned.

>From someone who fights as little as Trunks does, I don't think he'd
answer 'always.'
 

        Trunks could have won within a minute, but something about Ranma made
him want the fight to last longer.  

That and Ranma landed a shot to the...vitals and Trunks wanted
veangence.

He still won an hour later, but it

felt much more satisfying than outright overpowering his opponent as he
had done in the past Tenkaichi-budokai.

I have a hard time believing Trunks is Ranma's equal in shear skill or
cunning. Without using his greater strength and speed, of which he has
copious amounts to be sure, I doubt he'd win at all.
 

        Vejita woke up and stared at the arm lying across his chest.  It was
not attached to his wife.  He stared irritably at the sleeping Kakaroto
and wondered how the idiot had managed to invade his sleeping space.
Somehow, he and Kakaroto had managed to knock both of themselves out
during that last attack.

Add something like "looking around, Vegita realised' or whatever. 

        Bulma and Chi-Chi rolled their eyes as their respective husbands walked
in.  "Chi-Chi's decided to stay a few days since we haven't seen each
other in a long time."

Oh. They're surprised? Why?
 

        "Thinking of the human?" Nail asked.  Ever since he heard of the boy
Vejita was training, he had noticed a decidedly noticeable change in the
natural order of the planet.

Ranma still has an immense power level. If Vegita thinks
 he's roughly level with him when he cam to earth, as you said last
chapter, he could probably destroy the world. 

        "Still find it surprising that one of such little power can cause all
of this."

I think you meant that as a question. 
 

        Dende tensed at Vejita's name.  "You aren't still thinking of revenge
are you, Nail?  It's been so many years.  Most of the others have
already forgiven Vejita."

        "One colony is one colony," Nail replied.  "He is but one man.  Seems
fair."

Ooooh. Ancient hatred and incredible fighting. Of course, Vegita would
decicrate Nail. But then, something interesting always seems to pop up.

Nice chapter. And write more frequently. I get impatient.
  

The End. (maybe)

Yeah right. Not after leaving that hanging.

Miashara