Headcanon : everyone is trans (like EVERY SINGLE CHARACTER) but no one talks about it.
One day, one of them decides to come out just to be clear and it turns into an entire chain that passes through all the way to Homeworld
Steven: Guys, I'm trans. You know that, right?
Garnet: I know everything. I am, too.
Pearl: Aww, Steven! You're not alone here, all three of us are trans.
Amethyst: Yeah, dude! You don't have anything to be so worried about.
Steven, on the phone: So I told them, and then they were all like—
Connie: Ooh, yeah, me too!
Steven, knocking on the back doors: Hey, uh, Dad?
Greg, popping out with no shirt and top surgery scars: Oh, Steven! Have you been feeling okay this week, bud?
Cherry Quartz: So you went to tell your father person.
Cherry Quartz: And he was also trans?
Steven: Yeah! That's like, everyone I've talked to so far! What are the odds?
Cherry Quartz: ...so, are you gonna sign my new course schedule, or...?
Steven, tossing and turning in bed, half-awake: Uurghhgh... is it morning already? Why is it so bright in h—AAAAHHH!!
White Diamond, peering through his window from outside: Oh, Steveeeeen~! It's us! The Diamonds?
Yellow Diamond: We heard you were trans, and we came to give you our support.
Blue Diamond: I can hardly believe it! Our little Steven is trans, just like us!
Steven: [pulls his blanket over his head]