RoSaT

"Goten, our year is almost over, we have ascended beyond imagination, I have felt fathers power from in here, and I know you have too, I think it's safe to say that we have surpassed even him, this training was worthwhile, we must use it wisely" said Trunks with an air of satisfaction.
"Don't worry Trunks, I know all of this, all that's left is to find out who's the strongest between the two of us" replied Goten with a cheeky grin on his face.
"Okay, you're on, the usual 10 minutes then?"
"Sounds good...GO!"
In no time at all the two had disappeared and all that could be seen was sparks of electricity all over the vast room, as the two were giving it their all, it was amazing, Trunks would throw a punch, Goten would block then counter, block then counter, block then counter, always the occasional hit being got in, and when it did, dealing great damage.
As the two bounded around the room after each other, chasing after one another, Goten yelled out "5 minutes to go Trunks" then quickly faded out and sent a blast towards Trunks, hitting him in the back and sending him flying towards the ground, hitting it hard then bouncing back up, as he slowly got to his feet, all he could see was Goten flying towards him, leg outstretched, readying to kick, Trunks prepared to grab it, but Goten had disappeared, then Trunks turned around just in time to see a knee come into his gut and then a punch to the face sent him flying again, skidding along the ground.
Gotne flew into the air, "KA ME HA ME HA!" the blast rocketed towards Trunks and connected as a perfect hit, when the smoke cleared, and unconscious Trunks in base form was lying on the ground.
Goten flew down and Picked him up, flying back towards the sleeping quarters and lay him down to bed.
A few hours later Trunks woke up, "What happened he asked?"
"I won, that's what" said Goten in an annoying taunting voice.
A look of surprise and frustration came across his face as Goten started laughing, "Damn you" he yelled as he blew up Gotens bed, then turned back over to sleep.
Goten immediately stopped laughing and thought to himself "Aww, dammit, where am I going to sleep now, stupid sore loser"

Back at the Battlefield

"Who are you?" asked Cell, voice trembling with fear as he surveyed this new foe.
"I am your worst nightmare, and that's more than you need to know, since you won't even be long enough to care" said Vehan cooly.
Cell blinked, and in that short instant, Vehan had flown forward and landed 5 hits to Cells gut and face, crippling him and forcing him to lie on the ground with pain.
"A...a..amazing" Cell managed to splutter out, "i can't beat him, I'll have to use my old technique.
And with that he started swelling up very large, readying for a self destruct.
"Ohh no you don't Vehan thought to himself, I won't let you do this again.
And with that, he put one hand to his side, and one out in front, "MAAAA SENNNN KOOOO FLASH!" he yelled as he brought both hands together and launched a explosive blast at Cell, the kickback was so large it even forced Vehan back a few metres, Cell looked on in terror as he was engulfed in the blast, and instantly wiped out from existence.

"Well, that was easier than I expected" thought Vehan to himself, "It feels as though everyone is at the Lookout, I'll make my way there I guess".
And with an explosive force, he took off upwards towards the lookout, flying at in incredible speed, he started thinking to himself, "What are we going to do now, with Goku gone and all...".
But he was interrupted as he had already arrived at the lookout, he landed and everyone looked over to him.
"HEY!" yelled out Krillin in delight, you must be the guy that killed Cell, say, what's your name?"
But just as Vehan opened his mouth to speak there was a bang and two bodies were thrown to the side, everyone looked down to see Vegeta and Gohan lying on the ground.
As the two got to their feet and dusted themselves off, everyone looked in awe at the two, finally Piccolo spoke up.
"I get it now, that guy that came up here, he was the fusion of you two, correct me if I'm wrong"
"Yeah, that's exactly right Piccolo, me and Vegeta fused through the dance" said Gohan.
"Well I'm impressed Gohan, what a good idea"
"Actually Piccolo, it wasn't my idea, it was Vegetas" said Gohan with a grin on his face.
"Wow Vegeta" said Krillin in surprise, "You actually came up with the idea to fuse?"
"Yes, I knew we couldn't beat him alone, plus I've known the effects of Fusion before, the power you achieve is amazing, I knew it would be more than enough"
"Well well well, I'd be really interested to hear the whole story, if either of you would tell us?" asked Yamcha.
"Okay, I'll do it" said Gohan, "You see, it started like this...and then we flew up here" said Gohan wearily as he finished the long story.
"That's amazing!" said Mr. Popo.
"Tell me" said Vegeta, "Where are Trunks and Goten?"
"They're in the RoSaT" replied Tien, "They should be out in about half an hour now".
"Alright, we wait for them" said Vegeta sternly.

In the RoSaT

Trunks and Goten stood facing each other in the Room of Spirit and Time, just staring, no words, "Goten" said Trunks quietly, "We only have one day left in this place, whaddya say we have one last round and spend the rest of the day recuperating"
"Sounds good" replied Goten, equally as quietly.
As though both reading each others minds, they took off at the same time, moving so fast that a trail of lightning was following them behind, sound booms just like thunder could be heard echoing all throughout the room.
It was like a mighty storm brewing up, this one last fight was acting causing a storm, dark clouds loomed overhead as lightning crackled down from the clouds and hitting the two Saiya-jins, lighting them up and revealing their stern expressions, they were emitting so much power it was as though they were living lightning rods.
Trunks and Goten were giving it their all, it was not just a training battle, they were both acting as though it was a real fight, faces contorted in concentration, trying to figure out what to do next, Goten faded out as Trunks threw a punch to his head and reappeared behind Trunks, but Trunks anticipated it and thrust his leg out and caught Goten in the abdomen, Goten doubled over and held his stomach, Trunks pounced on this opportunity and started a furious assault of punch and kick combos, striking Goten with so much force, spitting out blood, Goten came to his senses and regained his posture, he faded out and above Trunks, he gave him a kick to the top of his head and was on top, forcing Trunks back, this time with his own punch and kick combos, after a while Trunks pulled out and incredible block as Goten punched Trunks in the stomach and then tried to spin kick him in the head, Trunks had grabbed his leg between his arm and body, holding Goten still, not letting him escape.

"It seems we're both even, there's not enough difference in our power to determine a winner, shall we keep going or do you want to settle this?" asked Trunks.
"How about we keep going" said Goten as he spun his body round and kicked Trunks in the neck with his free leg, "I haven't shown you my full power yet, just wait"
Trunks wore a look of great surprise on his face as Goten flew to the ground and got into a powering up pose.
"AAAGGGHHHHH!" cried out Goten, as if in pain, Trunks was just looking on, with a mixed expression of fear, anger and awe.
Gotens muscles were bulging up, his electricity was changing from blue to green and his pupils were getting smaller, it was like a USSj3.
Goten finished powering up, "Do you like the new look?" he asked, in a new voice, more deeper and gruff.
"Wow Goten, when did you manage this?" asked Trunks.
"I've been training at night when you've been sleeping, I haven't been able to sleep, I keep having nightmares of my father being eaten by Buu, so I decided to take up some extra training"
"Let's see how I fare against this new form of yours" said Trunks anxiously.
Trunks took off, he threw an incredibly fast punch at Goten, but it was blocked as though it was nothing, he faded behind Goten, expecting to surprise Goten from behind, but when he looked, Goten was facing him with a smile on his face, "Man, this new level of Gotens is intense, I have to chance, but I've got to try get at least one hit in" and with that he started an onslaught of kicks, punches and knees, elbows, anything he could physically attack with, but Goten was just slowly drfting backwards, dodging every attack, rather lazily too.
Angered by the ease of which Goten was dodging his attack, Trunks became infuriated, and with extraordinarily fast speed he faded out and above Goten, "GALICK GUN!" screamed out Trunks, as a large purple blast connected with Goten point blank range, sending him sailing towards the ground.
"Yes!" thought Trunks, maybe this new form isn't as strong as I thought. But as the smoke cleared, there stood a rather raggled looking Goten, his clothes all a tatter, but not a single scratch on his body, Trunks was speechless as Goten flew towards him with incredible speed and halted to a stop, his face an inch away from Trunks, "You ready?" he asked, but before Trunks even had a chance to open his mouth, Gotens fist had sunk into Trunks gut, instantly Trunks had slipped into base form, slumped over Gotens fist.

Back outside

"It's almost time" said Piccolo.
Everyone looked at him and nodded, Vegeta was sitting over in a corner by himself, "What's this power I've been feeling? It couldn't be Trunks or Goten could it, they couldn't have benefited from that one years training that much, whoever it was, they have definately surpassed me, and by quite a way".
But his train of thought was interrupted as Mr. Popo said "Look, the door, it's opening"
There, in all his glory stood Goten, in his USSj3 form, everyone just gaped at him, as they felt his tremendous power and saw Trunks over his shoulder.
"What happened to him?" asked Vegeta, "Tell me now boy"
"It's nothing Vegeta, he just injured himself training, Dende can fix him up right now, can't you Dende?" asked Goten.
"Why yes I can".
After a brief moment, Trunks stood up, gazing around at everybody, "Uhhh hey guys, he said rather sheepishly".

Now that Trunks was healed Vegeta was just staring in awe at Goten, transfixed as Goten stood there emitting a power unlike he had ever imagined, "Tell me boy, what do you call this form?"
"Uhhh, it doesn't really have a name, USSj3 I guess" replied Goten shyly.
"Amazing" said Piccolo, "Imagine how powerful these two are when they're fused, have you tried it?"
Everyone just stared at the two, waiting for an answer, "Well no, we haven't, we were too focused on our individual training" said Trunks, "Kinda silly now that you think about it, would've been interesting, two fused SSj3..."
Everyone seemed to float off to another world momentarily, pondering the strength of the new Gotenks, when Piccolo all of a sudden said "Let's gather up the Dragon Balls, I want to wish back Goku"
No-one had been expecting this, after snapping out of their day dreams it became clear that everyone thought this was a good idea, after a vote of approval from Dende everyone decided to go together this time, so Vegeta Goten, Trunks, Krillin and Bulma decided to go look while the rest stayed at the Lookout and decided to sparr until the rest got back.
"Let's swing by my house to grab the radar before we go blindly searching" ordered Bulma, "Now carry me Vegeta, and not too fast!"
With a roll of his eyes at Krillin and a mutter of "Wifes eh?" they were off.

"DAD!" yelled out Bulma as they got to Capsule Corp. "Where's the Dragon Radar?"
"Oh hello Bulma" said her dad cheerily, "Would you like some tea and cakes" asked her mum.
"Yes please!" cried out Goten and Trunks, wide smiles decorating their faces, but quickly faded as Bulam screamed at them "Nooo! No wasting time, we've gotta get this over and done with!"
Trunks made an angry cat noise as he said to Goten "What's up with today?"
"Wouldn't have a clue" replied Goten
They were about to sneak a cake when Bulma shouted out, "Vegeta! Let's go!"
With another sad look on his face Vegeta rather reluctantly lifted up Bulma as they flew off to the first Dragon Ball.