Your fusion name is the beginning of Ruby's name 'Ru' followed by your complete first name.
"Whaaaaatttttt?!" I hear Amethyst exclaim as Ruby and I fuse into our new fusion. "Oh my goodness! Y/n! Ruby! You fused!" Steven says with stars in his eyes. "You two look so cool!" Connie says now with stars in her eyes too.
~Steven's POV~
I see y/n and Ruby turn into a tall sun burned red fusion with a short dark red mohawk combed over to the side. They have two eyes, one red and one green and they're wearing Ruby's battle suit top and y/n's jeans, but they're dark red and they're wearing dark red boots. "Hello everyone! Y/f/n here! How is everyone doing today?!" Y/f/n announces themselves with a slight bit of enthusiasm in their voice. Y/f/n already reminds me of Sardonyx, but they seem to be a little hyper.
Y/f/n is jittery, I guess that's one thing they have in common. "We're good!" Connie yells, answering for all of us. "Yeah! We're good!" I still have stars in my eyes, I can't stop staring at them. I've never seen Ruby fuse with anyone but Sapphire, but I'm not complaining... They look awesome. They remind me of a boxer warming up for a match, hopping back and forth and always moving.
"Dude, why did you two fuse?" Amethyst asks and y/f/n looks at her with a smirk, "Ruby and y/n was outnumbered and in trouble, but now... Y'all are in trouble." They give us a devilish smirk and my eyes turn back to normal, "What do you mean, we're in trouble?" Y/f/n looks back to me and crouches down in front of me, "You guys were tickling them, but now... Its our turn." They bop my nose and I gulp. That was the only warning y/f/n gave us before they tried to grab me with their big muscular arms, but I quickly dodged it by ducking, then we all take off running.
~ Y/n is Italic and Ruby is Bold~
~Y/f/n's POV~
I start chasing the trio in the same direction the train is going. To my surprise, they all are faster than I expected, but it won't take long until their short legs wear themselves out, but thanks to Ruby being an eternal flame and y/n's superspeed, I'm basically a flaming bullet. I'm not even using an eighth of my running speed and I'm already in arms length of scooping up all of them and getting my revenge on them.
"Please y/f/n! Have mercy!" Steven screams. I smirk, "No mercy!" I swoop all of them up in one big scoop and hold them all against me in one arm and my free hand begins to tickle them all rapidly. "Muhahahahahaha!" That's Ruby's side of me coming out. "Revenge is sweet." "It sure is babe, and I'm so glad we get to return it together!" I spend at least a good few more minutes tickling the three, until they're all out of breath and coughing, then y/n's side of me decides to let them go.
I place them on the ground and they struggle to catch their breath. I cross my arms and smirk, "Do y'all give up? Or do we have to go round two in you?" "No! No! No! We surrender! You win!" Connie says, getting her breath back in its regular pattern. "Wimp." Amethyst comments and I just smile. The train whistle yells in the background and its at least a good ten minutes away from us. "Jeez, it looks like we need to go catch the train again. Pearl and Sapphire must be worrying." I say as I run my fingers through my hair. "But how? The train is already a good distance away from us?" Steven says with a little concern in his voice. I smirk, "I got an idea."
~Mini Time Skip~
All of us make our way to our cart, dodging glances all the way there. I carried all of us here in a flash. Steven opens the cart door, "We're back! And we brought a new friend!" He enters the cart with Connie and Amethyst following behind him and in front of me. "What do you mean new fri-e-end?! Steven! Who is this?!" Pearl exclaims as I step in the cart and close the door.
I give a slight wave with a little smile, "Hello, I'm y/f/n." Sapphire drops her Queen besides Pearl's King, "Checkmate." She says with a big smile. "What?!" Pearl yells and I don't know if that's towards me or the game. Sapphire hops down from her seat and comes to the middle of the cart in front of me. She parts her hair, revealing her big blue eye, "Y/n? Ruby?" I smirk and kneel in front of her and kiss her hand, "Our Sapphire." Her eye widens along with her smile if that's even possible.
"Ruby! Y/n! How are you-? Why are you-? When did you-?" Pearl goes on as she tries to process my appearance. The others just take their seat beside her and Amethyst pats her shoulder, "P, let's just say all is fair in love and war, or in this case, in Cowboys and Indians." Pearl just looks at her in confusion, "What does that supposed to mean?!" The kids just giggle, "We outnumbered Ruby and y/n in Cowboys and Indians, but that changed when y/f/n came along." Steven explains and Pearl just rolls her eyes and prompts her head up on the chess board with her elbow, "Oh boy, I can tell this trip is gonna be full of surprises." We all just laugh, but then my attention goes back to Sapphire dragging us back to the seats across from the others.
We sit down, and she starts asking us a lot of questions. "Loves, how does it feel being fused together? Do you like it? I mean you must because if you didn't, you wouldn't of in the first place. Ruby, is-" We stop her with a finger on her lips, "Babe, we feel amazing and really hyped up. Its gonna take some getting used to, but we can get used to it later. But for now..." I unfuse.
~Y/n's POV~
"Let's just relax." "Yeah, playing Cowboys and Indians with these knuckleheads," Ruby thumbs over to Amethyst, Steven and Connie, "wears a gem out." I just smile and Sapphire giggles, "Well, I hope you aren't too tired to fuse with me." Ruby cups her cheek, "Never. " They kiss and they get up and turn back into Garnet. "Welcome back." I greet her as I spread my arms on the back of the seat with a smile. She smirks and comes sits by me and kisses me, "Its good to be back." "Ugh... No romance on this trip you two." Amethyst groans and we just look back at her, "No promises." Garnet says as she adjusts her visors with a little smile and I just chuckle and pull her closer to me. This is gonna be a long ride for her then.

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Steven Universe : Garnet x Male or Female Gem/Vampire Hybrid Reader Love Story
FanfictionThe title basically tells it all. I do not own Steven Universe, nor the characters, nor the locations in Steven Universe. All rights go to Rebecca Sugar and Cartoon Network.