Random idea I got while watching the Steven Universe episode Crack the Whip. What if at the end, Jasper fuses with Amethyst instead of going back in the ocean? What if Garnet comes in to fuse with Stevonnie?
Characters
Steven
Connie
Amethyst
Jasper
Stevonnie
Ametrine (debut)
Garnet
Sunstonnie (debut)
Lapis (mentioned
Malachite (indirectly mentioned)
Pearl (mentioned)
After Jasper poofed Amethyst and Steven and Connie fused into Stevonnie, they have just poofed the corrupted gem monster, while Amethyst has reformed ready to fight
Amethyst: Steven, Connie I'm back. Everything's going to be just... Huh?
Amethyst sees that Stevonnie has defeated Jasper and is shocked about it
Jasper: Fusion! Fusion! It's always fusion!
Stevonnie (Steven): Are you ready to apologize?
Jasper: This was just a warm up! Get ready for next time Rose! Jaspers don't give up! Jaspers keep going until we get what we want!
Jasper than flies up and lands next to Amethyst
Jasper: Glad you're here! Aren't you tired of being a weak defective Amethyst?
Amethyst: No.
Stevonnie (Connie): Don't listen to her.
Jasper: Together we'll rue the planet.
Amethyst: I have to protect them. I have to save them. Maybe I can do what Lapis did.
Amethyst grabs Jasper's hand much to Stevonnie's shock
Stevonnie: NO!
Jasper and Amethyst fuse into Ametrine
Ametrine (Jasper): Fool you can't hold me down.
Stevonnie (Steven): This is bad.
Stevonnie (Connie): Real bad.
Garnet comes as she witnesses it through her future vision
Garnet: Stevonnie?
Stevonnie: Garnet. We can explain.
Garnet: I know what's going on.
Stevonnie (Connie): We got to stop her without poofing Amethyst.
Garnet: We will. But we're going to have to fuse.
Stevonnie (Steven): Is that even possible?
Garnet: Wouldn't hurt to try.
Garnet and Stevonnie fuse and form Sunstonnie
Ametrine (Jasper): Aw you trying to stop me?
Ametrine (Amethyst) Don't hurt them.
Sunstonnie: You're going down Jasper.
Ametrine (Jasper): Give me your best.
Sunstonnie flies up to Ametrine and successfully pulls out Jasper's gem which causes Amethyst to unfuse
Sunstonnie then poofs Jasper and bubbles her away and they unfuse
Steven: Amethyst why would you fuse with Jasper?
Connie: Yeah she could have ruined you.
Amethyst: I did it to protect you guys.
Garnet: That was sweet of you but you could have been in serious danger. Remember what she did to Lapis?
Amethyst: Yeah. I guess I'll leave the Crystal Gems.
Steven: No. You can't leave.
Connie: Yeah we need you.
Garnet: We're nothing without you.
Amethyst: But I fused with the enemy.
Steven: You did it to protect us.
Connie: Yeah that was kind of brave.
Amethyst: Can you do me a favor and not tell Pearl about this.
Garnet: I have a feeling she already knows.
The End
Note: Hope you like my alternate ending
Note #2: I'm not 100% sure if Ametrine is the fusion name for Jasper and Amethyst but I'm sure Sunstonnie is the fusion name for Garnet and Stevonnie since Garnet and Steven's fusion name is Sunstone

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