"So… you have… something, that talks to you in your head? What's that like?"

"Yeah. She's a—well, the term we've been using is symbiote?

She's physically bonded to me, and we think she can probably manipulate my biology and stuff, if she tried."

Naruto scratches his head.

"Manipulate your… biology?"

"Like, transform me—and properly, not like a Henge."

"Oh, right."

Oh, wow. That sounds really…

"Could—can she do that to other people too?"

Wait. That expression. Is...

Oh, right, that might be scary for him.

"Don't worry! She couldn't do anything to anyone she isn't bonded to, and there's no way she'd do anything like that to someone against their will, anyway—trust me, she's way too much of a softie for that."

Sakura giggles, and sends a burst of affection to Sable.

Awww. It loves her too.

It's maybe noticed something, though. That expression didn't look like fear to it. No, that expression is... familiar. 

Oh, did she read that wrong?

No, that wasn't what he— oh nevermind, it's fine.

"Oh, glad to hear that, then."

Okay, the confusion at Sakura's response confirms it, that wasn't fear about her capabilities. That was something else.

What could it be? It was a strong reaction, for sure. Naruto didn't look angry, and really anger just wouldn't make sense with the confusion and cheer after Sakura's reply. He looked shocked or surprised, and not much other than positive options are left at this point. A shocked positive reaction... hope??

The only reason for hope here is a desire to see someone have their body modded, and Naruto's all alone, which rules out desire on others' behalf...

Egg?

{…What?}

"…I guess we should probably get back to class soon—oh, but we should talk to Hinata as soon as possible: can you get her right after class?"

And she should make sure he isn't planning on telling anyone.

Right. "And remember, you can't tell anyone about this—even Hinata, until we're sure we're alone."

So it thinks Naruto looked hopeful there, not scared. Naruto is all alone and thus has no one else to want a bodymod for. And the biggest reason for a person to feel hopeful about a bodymod for themselves is if they have something they want to change about their body. The most obvious thing someone could want to change about their body is to make it match their gender identity if they're trans. Secondary things that sometimes come up are desires for animal features or other unusual traits.

But that kind of shocked, painful hope is familiar to it, because it felt like that in the past, when it realized there was an explanation for the pain it felt about its body, and there were treatments.

It thinks Naruto might be like it in this.

The typical thing trans people called other trans people who hadn't realized it yet, back in its old world, was "egg", because they'd have a realization and hatch into a new identity. The term is also sometimes used for trans people who've very privately realized it and not come out to anyone.

Egg.

"Can do—and no worries, your secret's safe with me!"

Naruto begins walking towards their class.

Oh.

Well crap, that sounds like something she should probably address.

There's no time now, but maybe after school? She'll definitely need Sable's help with that one, though.

She follows Naruto.

Sable gives Sakura a fierce internal hug. Yeah, they've got this. She can coach Sakura on what sorta stuff to say about that.

She's proud of Sakura for how she handled this, too. She did a good job, and Sable's really happy to have her as a host.