Opal, Ruby, Sapphire AU | Steven Universe

The Power Couple and The Diamond

Kyanite's violet form dissipated and Steven and Sapphire stepped apart. Ruby noiselessly dropped down beside them, elongated arm shrinking to its normal size.

        "Nice form, Sapphy!"

        Sapphire gasped, as if just remembering her reformation, and gazed down at herself in delight. Whereas her previous dress had trailed along the floor, now the opaque, cyan material reached just below her knees, exposing periwinkle-stockinged legs and feet. A cerulean bodice now covered her torso and could be seen through the skirt, secured at the waist by a white band that dipped at the front. Her sleeves remained white, and her gloves were shorter, now stretching to halfway up her forearm.

        "Oh, this is refreshing," she breathed, and then her visible eye lit up, fringe swept back from the fusion. "Steven, we fused!" she smiled delightedly, and stepped closer to give him a fleeting hug.

        In that moment, Bismuth, Peridot, Lapis and Connie descended beside them.

        "Are you guys okay?" Connie burst out.

        "Almost," Steven returned, and gazed down at the gems in his hands—one white and smooth, the other purple and faceted.

        "Opal, we're up against a giant robot—we need you. I'm here," he said hopefully. "I love you!"

        The gems instantly set aglow, and Steven was again lost in an amalgam of white, which then expanded, growing taller and more defined, until a shock of spikes exploded around its head and it opened its four eyes.

        The silver-blue fusion immediately leapt to attention, summoning their modified bow and arrow—which now appeared more like a rounded triangle lashed through with a smooth lasso. With a burst of light a pink shield materialised in one of their four hands and they clashed it together with the bizarre contraption, yanking on the threaded lasso. The shield disappeared in a convex blur and, aiming the pointed end of the blur at the descending robotic foot above them, the fusion ripped the lasso free and the spinning top went flying, exploding in a cloud of glittery smoke on contact with the mech. The huge, conjoined ship stumbled in a sluggish fashion, as if backpedalling in water.

        "Accurate and destructive," the fusion smirked, and twirled triumphantly.

        "Wow!!" Ruby cried, throwing her hands in the air. Beside her, Sapphire smiled proudly.

        Peridot looked pleasantly envious.

        "Alright!" Connie cried. "Go, uh . . . go . . ."

        "Moonstone," the fusion supplied. Their voice was like a sigh. They were around Opal's size, with a slender figure and aquamarine skin. Icy spikes shot back from their head in an attempt at hair, and shone with creamy streaks. All three centred gems glinted against their body in hues of pale blue and off-white. They had no facial features to speak of except for their two sets of lidded, sleek eyes, the topmost of which were lined with azure strokes, oddly reminiscent of eyeshadow.

        Steven's jeans now only just extended past the tops of their thighs and his shirt had seemingly grown shorter, now exposing the midriff (and his miscoloured gem). Their feet tapered to graceful points and added stalactites pointed away from their heels. Though everything about them seemed sharp, their eyes were soft and smiling.

        "Moonstone," Connie began. "What are we gonna do? White Diamond is never going to listen, and she's never going to let us leave."

        "Then we shall have to make her listen." The fusion's eyes lilted coyly. "Ruby, Sapphire, if you're comfortable, I think it would be best for Garnet and I to climb the Diamond ship. Are you in?"

        The two Gems shared a tense look. A few seconds ticked by.

        "If Ruby can tolerate taking a back seat," Sapphire finally said. Her lips quirked in a smile.

        "As long as we make it quick," Ruby fired, giving her a playful push.

        Moonstone exhaled and gave a tinkling laugh. "Perfect. Let's go."

        A moment later, the two fusions were sprinting across to the mech, and leapt in unison onto a gargantuan pink leg, energised digits locking onto the smooth surface. The remaining Crystal Gems' cheers spurred them on as they began to climb.

        The leviathan mech, though, had suspiciously ceased all movement. The moment Garnet reached up to scrabble for purchase on the ship's "thigh", the robot dropped jarringly onto one knee and raised its arms, fingers crooked.

        "Uh oh," Garnet said.

        The giant hands swung down and knocked Moonstone flying. They soared over the Gem gathering on the ground and faceplanted, unfusing and rolling apart.

        "Steven! Opal!" Garnet called out in worry. The hand ship moved closer and she reached out, summoning her gauntlets and sending electricity coursing through the circuits, before breaking apart to duck under the spasming limb.

        Sapphire grabbed Ruby's hands in her own and launched them both off the mech, skirts catching the wind as she floated them both down.

        "Are you two okay?" Sapphire asked, kneeling beside a face-down Opal. Ruby helped Steven to his feet.

        "We need to be bigger," Opal replied, sitting up.

        "Then let's fuse—all of us!" They all turned to a beaming Steven. "It's the only way we'll get up to her head!"

        "YEAH! I'M IN!" Ruby punched the air.

        "I'm in too." Sapphire nodded with decision.

        "Then it's decided." Opal pushed herself to her feet and set her hands on her hips. "It's time to form Obsidian."

PROMPT: "What if you made Steven fuse with opal instead of garnet from the change your mind scene. That would be amazing. I would love to see what you do with it" — for xAlphaAshx! Hope you enjoyed! :)
        I decided in the end to make a parallel of Sunstone for this fusion, with no colour origin or mineral bases whatsoever. But my love for parallels outweighed the negative aspects of this fusion for me. If you would like to see some sketched renders of Moonstone and their weapon, you can head over to my Instagram, tatttletale.ig !