...he thinks she's pretty. She wasn't deliberately trying to read his thoughts—Uncle J'onn told her that's considered rude on Earth—but that one's about her and it's kind of hard to ignore.

And now he's waiting for her to say something. Time to test out the American accent she's been practicing. 

"Hi...it's nice to meet you." Oh, right, handshakes are a thing, they work like this...she's got this. Totally. 

!!!!

She's Martian, and Martians are telepaths! He has ever used telepathy in his life, he doesn't have it, but he can definitely project friendliness and 'hi you can come talk to me' mentally. He does that. He so does that.

Hi!! / Wow you came a really long way to be here! / Are there things you're confused about / Can I help? / Hi!!!!! It's so great to meet you!!!! / ~Telepathy!!! telepathy!!! telepathy!!!~ / I'll give you space if this is too much! New things can often be a lot! / I just want you to be safe and happy and be somewhere you like!

It would be impossible to fake this much sincerity. He is very sincere.

!!!

Hi! she replies gleefully. It's good to meet you too! I wasn't expecting anyone on Earth to be this comfortable with telepathy!  'Comfortable' seems like an understatement. He really likes telepathy!

She sends him her current mood: a little bit overwhelmed by all the new things, but relieved to be using a familiar means of communication. This is definitely helping.

I was raised/grown/taught with telepathy! I miss it, and I'm really really really glad I can talk to you with it! It's nice! And I'm glad that this is helping - do you want context and explanation for all of the new things, I can just send you mine if that wouldn't be too much?

He has not moved since he saw her, in favor of standing right where he is with the biggest smile on his face. He's forgotten that walking up to say hi to her in meatspace is a thing that matters, he's busy saying hi to her.

Robin and Kaldur have gone over to greet Miss Martian and welcome her to the team. 

It's hard to tell, because he's so quiet by default, but Kaldur is maybe a little distracted. He's staring off into space with a vaguely mopey expression. 

Robin, by contrast, is perfectly chipper. 

"Hey Rain, come meet Miss M!" he calls over his shoulder when he notices the other boy hasn't joined them. 

..? That's what he's doing...?

Oh, right. Meatspace. Yeah, okay, sure. He bounces over to aim his brilliant smile at her instead of just aiming his thoughts at her.

...

Batman had a whole 'this is what you will be doing' speech prepared. It has now been sidetracked. In retrospect, this was predictable.

He's just going to wait until they're done.

I think I'll manage, Miss Martian says to Rain, but it's sweet of you to ask.

Smiling! That is the thing humans do when they're happy! It's easier to make the connection when she has Rain right in front of her, smiling and projecting 'happy' at the same time. Learning human body language from television was hard without that sort of cue. 

"Hi," she says out loud, mostly for the benefit of everyone she isn't talking to telepathically. 

"If you don't want to call me Miss Martian, I'd prefer 'M'kel' to 'Miss M'," she tells Robin and Nate. "M'kel M'orzz." 

"You got it," says Nate.

He takes his best shot at pronouncing "Muh-kel. Wow, that has...too many consonants or something." 

Robin snorts. "Wow, rude." 

He grins at M'kel. "Just ignore Nate, you'll get used to him."

Ignoring Nate's indignant spluttering, he leads her over to where Batman and the other mentors are waiting with varied levels of patience. Kaldur follows, as does a pouting Nate. 

Okay! Let me know if there's anything you need!

Rain bounces over to Batman and the other mentors. He's feeling very bouncy, today. Bounce, bounce, bounce.

Awwww. 

Batman begins explaining what will be expected of them; they have a supervisor, but their own organizational structure will be up to them. If they want to have a person in charge, they'll need to pick them. The League will provide them with supplies and equipment; if there's anything they feel they need, they can make a request. Mount Justice will serve as their base of operations and a home-away-from-home for any members that need (or want) it.

And then: security procedures. Such security procedures. Since they'll be working through the Justice League Zeta-Tube network, they will be expected to uphold Justice League security standards. Mount Justice is in the process of being placed under a glamour, so as not to draw attention that it's being called into use again; they should try not to compromise that. Here are the procedures they should follow for trying not to compromise that. Here is where they can find the procedures they should follow for trying not to compromise that later, should they ever feel that they don't know the procedures well enough. They should know the procedures well enough. Ahem.

Batman has a talent for sucking all of the fun out of things, and he definitely deploys it here. This is serious business, they will conduct themselves as such. Fun is not unauthorized, but fun does not come at the cost of their safety. Ever.

After the seriousness of the whole affair is good and impressed upon them, Batman finally releases them. Mount Justice is still being set up for their use, but they can do what they like.

"Yes! Time to go exploring," Nate declares, stretching. Judging by the way his foot has been tapping for the last fifteen minutes, he's more than ready to move. 

"Rain, did you find anything cool yet?" 

"Depends on the definition of cool! There's a waterfall in one room, and a big library, and there's a - cave place... thing... Plus there are a lot of, uh..." He waves his hand awkwardly, trying to figure out his words. To M'kel, he sends an impression of a network of caves and passages and corridors, some of them secret and hidden. This quality is approximately his favorite of the entire base; it's tricky to learn, and there are downsides to it, but it gives them a home advantage in case this place gets attacked. They could run circles around anyone that didn't know the area so well. This helps him coalesce his thoughts, and he explains to everyone else: "Secret passages and corridors and convenient air ducts. It'd take hours to learn them all, I think they're neat."

"I know what we should do."

Robin has a massive grin on his face, which is either promising or worrying. 

Kaldur is opting for 'worried'. 

"...what." 

"We should play Hide and Seek!" 

... Rain bounces, grinning. He doesn't precisely know what Hide and Seek is, but from the name, he can hazard a guess. He's pretty sure that it's going to be ludicrous amounts of fun.

"Okay! What are the rules and how do we play?"

"We should be certain all of us are playing by the same rules, since we all come from different backgrounds," Kaldur agrees.

"The version played in Atlantis involves one person waiting for a set time while all the others hide, then heading out in search of them. The players can move between hiding places, or stay in one spot and trust that they have chosen well. Those who are found first help to search for the rest." 

"Sounds great!" Nate says. Robin nods immediately.

"Who wants to count first? Oh—and we should totally invite Yvette to play, right guys?" 

"Yvette?"

That sounds almost like a Martian name, but Uncle J'onn would know if there were any other Martians affiliated with the Justice League. They're probably a human. 

A team member she hasn't met? A League member her uncle didn't mention? Perhaps a servant of some kind? 

"My sister!" He sends an explanation. He's a clone and was made in a test tube and recently had a divorce from his creators of the violent variety. So his parents (the concept is still a bit new to him, but he's positive about it) decided to adopt him to help him adjust to the world, and also to give him a set of parents. Maybe other parents might suck, but his are great, and Yvette is therefore his adopted sister! She's also really great! She's not on the team, but she's associated with it and maybe-eventually-might-join. This is because she's Eventide's daughter (oh, right, by the way - Eventide: his dad, but that's not public knowledge) and therefore knows magic. She's here upgrading the base with magic. Rain isn't sure how she'd be good at Hide and Seek, but he's pretty sure she's going to be fantastic at it.

"We should definitely invite Yvette to play," agrees Rain.

"Oh, okay." I have sisters and parents too! Well, not sisters exactly, Martians don't really do gender, but siblings. Twenty-nine of them. None of them are as great as Yvette sounds. 

And while she remembers, they should probably tell everyone else that telepathic conversations are a thing that's happening.

"Um, Rain is helping me out by telepathically sending me things? If anyone else wants to do the same, that would be helpful, but you don't have to. I know telepathy isn't normal on Earth—and I'm not reading anyone's mind unless they give me permission," she hurries to add.