Yes, I started this off with the episode Catch And Release, and for reassurance I have seen the very last episode of Steven Universe.
r/stevenuniverse/comments/3nayai/triphane_steven_peridot_fusion/
This is for a better idea of their fusion.
After a successful and happy day, Steven was now in his bathroom attending to his body as he scrubbed his teeth to a pure white. Once Steven had finished brushing his teeth, he shoved his head into the sink before jolting back out and drying his face with a red towel that hung from a small lever near the sink. With Steven's exhaustion continuously growing, he quickly took hold of a nearby Q-tip and pressed it against one of his ears, forgetting about the other as he threw the Q-tip away and headed towards the toilet.
After taking a seat on the toilet, steven took the used towel once more as he lifted up his shirt, taking a quick peek at his gem before releasing that it really needed to be cleaned. Steven took the wet towel that he had used before and placed it upon the dirty pink that layed in where his belly button should be. Steven tossed the towel back onto the sink, he then looked down at his now sparkly gem, giving a sly smile and thumbs up to himself before jumping off the toilet and heading for his bed. Wanting to use the rest of his energy so he could get the best sleep possible, he ran towards his bed, jumping into the covers at a quick pace. In only seconds, Steven felt more tired than before as his heart started to decline due to the sudden energy released from his body. Steven took a quick look at his stuffed animals as he leaned upwards, "Goodnight HappyBear, goodnight SadBunny, goodnight playful-kitty, goodnight ominous triangle at the foot of my bed." Steven completely ignored the nuisance of his carelessness as he closed his eyes but was soon brought back to reality when he gained some composure about it. Steven opened his eyes once more to take another look at the 'Ominous Triangle,' but it was no longer there. Guessing that he was just imagining things, Steven closed his eyes once more, "Whatever," Steven probed.
In only a single second, Steven felt a cold hand of metal claw towards his mouth, keeping him from shouting for help as he squirmed around, trying to break free. Steven was then dragged to the warp pad, relentlessly pushing as hard as he could against the now recognized Peridot, managing to get his mouth and a few parts of his body free but only after being warped to the warp-station. Recognizing that screaming for help would be helpless at this point, he started banging against Peridot, "Ah, let me go!" he demanded before being thrown to the ground. Peridot was getting agitated, not only because of his constant struggling but also by the fact that her technology couldn't keep him still because of his strength. Peridot had had enough as she pointed her robotic arm, unknown to Steven, towards the boy before angrily stating aloud, "Enough of this." Steven was encased in a green orb as he was lifted into the air, "What do you want from me?" Steven innocently asked, slamming his hands against the inside of the orb but showed not to be helpful. Peridot moved slightly to the other side of the warp pad that Steven was hovering over before impatiently answering him, "I want to get off this gem forsaken planet!"
Peridot then released Steven from the orb, dropping him onto the warp pad. After landing on the ground, Steven looked up towards Peridot who was now pointing at the warp pad with her fingers that combined into an arrow, "You have to fix this!" she begged, frowning her face. Steven frowned as well as he backed up and rose his hand in confusion, "wait, what?" Peridots feelings slightly declined when she heard Steven say that, "You're my last chance, I've got no flask robonoids, I've got no foot," Peridot stopped for a slight moment as she pointed at her missing foot before continuing. "I've got no response from yellow diamond." Peridot stopped as she quickly breathed through her nose. "I know you fixed Lazuli's gem, whatever you did, you got to do it to the homeworld warp!" Peridot shouted as she rose her hand into the air and formed a green energized ball, "Or else!"
Steven took no more than a second to respond, "O-Okay just give me a second, my mouth gets really dry when I'm scared." Steven rose his hand to his mouth, filling his palm with a large quantity of saliva. Steven then smacked his hand towards the pad and hoped for the best. "Here Goes," Steven said. He was soon let down when his powers didn't work their magic, but it was no surprise to Steven that it wouldn't work in the first place. There was an awkward silence as both he and Peridot looked around, understanding that nothing would happen.
"What was that?" Peridot asked as she extended her fingers towards Steven in a non-harmful way. Peridot then started sounding more desperate as she continued, "It didn't do anything!"
Steven lightened his gaze on Peridot as he embarrassingly avoided eye contact, "It... doesn't always work," Steven said.
"No... No-no-no-no-no! It has to work!" Peridot shouted at Steven, accepting her inevitable death that would soon come in the future.
Steven, seeing the fear and sadness in Peridots stature, replied, "I'm really sorry."
Peridot brought her hands up to her head as she started making deranged laughs, backing away from Steven but soon falling to the ground. "This was it," Peridot made a sad huff and brought her legs together before continuing, "This was my last shot." Peridot then thought of her inevitable outcome in the future as she brought her hands to her knees in fear, "I'm gonna die here..." Peridot then layed her head between her robotic knees as she started crying, repeating a sad "no" over and over until Steven spoke up.
"Hey, hey c'mon, Earth isn't... that bad," Steven said, attempting to comfort the green gem. Peridot suddenly changed to a more agitated state after hearing that. "It doesn't matter what the Earth is like, it's not going to be like anything soon!" Peridot gripped her hair, mouth, visor, and shoulders with her fingers, trying to relieve her stress but ultimately failing.
( This is when the crystal gems pop up, but no, not this time )
"What do you mean?" Steven asked, getting closer to Peridot to comfort her. Peridot huffed once more as she gripped onto her hair and shoulders even harder than before, "Oh what does it matter, there's nothing you can do..." Peridot started visibly crying as she lightly slammed her head against the ground as if begging. Steven scooted closer to her and put his hand on her back, stroking back and forth in the attempt to comfort her, "I'm sure we can get through whatever it is... I think..." Steven stopped when Peridot looked back at him, lifting her visors for a slight moment to clear her shameful tears. "Maybe 'I' could, but I would never be able to do it if you and your 'Friends' keep chasing me everywhere I go," Peridot stated, attempting to be threatening but failing. Steven stopped stroking Peridots back and placed them back into his lap as he gave Peridot his weird starry eyes that somehow lightened the mood for Peridot as she took a closer look at them. Steven started getting excited as he reached out for one of Peridots fingers and took hold, "You can become one of us!" Steven offered. Peridot backed up and looked at Steven like he was crazy as she spoke up, "Are you crazy! You miscalculate if you think I could be accepted into your... cult, just like that."
Steven slightly frowned at the word, cult, but didn't lose his excitement none-the-less. "Cult-? Nevermind, I'm sure they will forgive you if you apologize... we've done this before, trust me," Steven then shoved his other hand towards Peridot who backed away from his hand, fearing that it was a weapon. Peridot gave it some thought as she looked at Stevens' eyes once more, telling her to accept. Peridot didn't know what it was that she was feeling inside her, embarrassment most positively. Peridot had taken a solid 10 seconds to think before coming to a conclusion, accepting the feeling inside her that told her to trust the hybrid gem. "Alright-" was all Peridot could say as Steven jumped at her, giving her a hug as he realized that Peridot didn't know what a handshake was. Peridot felt her form slightly glitch for a short moment as Steven clung to most of her real body. "Congratulations Peridot! You're now a member of the Crystal Gems!" Steven stated, assuring Peridot.
'Oh, so this is just how they accept others into their... group.' Peridot thought as she attempted to return the hug and succeeding. Due to Peridot being naturally as short as Steven, she felt like she could relate to Steven the most, this was another factor in which why Peridot eventually decided to join the team.
Steven was so excited about Peridot no longer being an enemy that he had surprisingly lifted her into the air and playfully spun her around, making Peridot chuckle, unknownst to herself that she was feeling happy for the first time in that last month. Steven stopped spinning when he felt his gem glow and start gravitating towards Peridot who was also floating towards him. Steven and Peridot panicked for a slight moment until they eventually felt themselves successfully combine, followed by a bright light. Due to Steven not physically touching Peridot when the fusing was taking place, their gems pulled themselves together until they eventually touched and started the process of the fusion. Steven had never fused with anyone other than Connie, and even that was sometimes hard to accomplish time to time even though they knew each other very well and never kept secrets. But, there were other factors that went into fusing that Steven had yet to understand yet. ( Were calling her Triphane )
"What..." The new fusion said as it battled it's combined personalities.
"Wow! We fused! I have to- | Wait! We did what!" Triphane asked herself as she picked up one of her limb enhancers, spooking Steven. "AH! I cut your body in half during the fusion!" Triphane said as it backed away and fell on its butt. She slowly stood back up before blushing to herself, "My limb enhancers!" She shouted as they started falling off the warp pad and towards the ocean. Triphane quickly regained balance and attempted to run so to catch the technological bodyparts but failed as the height of her legs got the best of Peridots half. Steven, having fused and had been this tall once before, would've been able to move without difficulty, but he wasn't the one who was moving. Steven, still being in shock about their sudden fusion, had completely ignored the fact that Peridot had yet to grasp onto what was happening. Only after a few more seconds did Steven figure out that Peridot was more confused than he thought she was, "Oh, I guess you've never done this before... have you?" Triphane asked to herself. Peridot, trying to get a hold of the situation and the new body she was in, stumbled a few times until it eventually started falling off the platform. "N-W-Ah!" Peridots half shouted as Triphane started falling off the edge. One of Triphanes eyes closed but the other stayed open as Triphane, with her back two arms, reached upwards and latched onto the edge. Pulling herself back onto the platform, Triphane layed on her back, looking at the sky before speaking up, "No..." It replied. Steven had almost forgotten that he had asked a question due to what just happened. Steven started explaining the rules of being a fusion, sending mental images to Peridot through their fused minds. Triphane, being both a being its self and two other beings at the same time, stood up on her own as a combination of what Peridot and Steven had wanted to do. Peridot, still not used to the new height, tripped against herself as she tried to walk towards the warp pad.
Neither Steven or Peridot knew how they would explain their situation, especially Peridot since she had been trying to kill the Crystal Gems for quite some time and out of the blue, decided to join them. Peridot started rambling in 'her' head, thinking about the outcomes and nervously pouting within herself. Steven, being able to hear Peridots thoughts, laughed, confusing Peridot. "What are you laughing about?" Triphane asked herself. "Peridot, you know I can hear your thoughts right?" Steven answered before laughing again. Triphane angrily blushed as she rose a hand to her face, "I'll get you for that!" Triphane then smacked herself, causing Steven to hiss and Peridot to make a yelp as the pain was split between them. Peridot didn't think it through at all. It was surprising as to how much it hurt, it felt as if a boulder had been thrown at them. "Hey! That hurt you know, | Yeah-I-know" She said sarcastically, "I felt that too, strange how this works."
After a solemn 3 minutes of fumbling and falling over in the warp-station, still having yet to get to the warp pad they wanted to reach, Peridot and Steven started questioning their circumstances once again but as Triphane.
"Wo-ah," She said as she finally layed one of her hands on the warp. "This is crazy- | So this is... Fusion?" she asked herself, regaining composure as she stood solidly upon the warp pad. "So... I can fuse with gems! | You- I- we've done this before? | No, I've done this before... but it was with-" Triphane stopped talking as she started to warp. Never could anyone have predicted such a colorful and beautiful fusion, especially with a Peridot. Some would even say that such a fusion would come out... highly unprecedented. Once Triphane finished her warp, she was finally used to the height and length of her legs as she walked off the warp pad with little effort. Using one of her front arms, being, Peridots half, put her hands to her forehead. Triphanes vision cleared as the familiar visor appeared on her head. A yellow light following behind them as they made their descent to the temple.
Triphane took a second to think once more before shining a bright yellow, splitting in two. "Wait! Don't go yet, they'll shatter me if they see me!" Peridot commanded, but her pleading was proved helpless as they completely unfused. Steven didn't resist as he felt his energy deplete into nothing, falling flat onto the ground, passing out the instant he touched the ground.