If Riley was a princess, Robyn was siren. Riley was content to brush her long, brunette hair while she waited for her prince to rescue her, probably perched in some tower full of ball gowns and glitter. Robyn lured sailors to crash on her shore with her silky voice and a flip of her loose caramel curls. She didn't have time to wait for someone else to save her. She had better things to do. If Riley was a superklutz, Robyn was tightrope walker. When Riley was loud, Robyn got quiet. If Riley said no, Robyn yelled yes. Always a balancing act between the two.

The two twins met in the middle when it came to people. Friends, family, both of them sharing the same deep, selfless love for the people they cared about the most. They were both always looking out for the best in people, even if Robyn kept her observations a little quieter than her sister. That's why, despite all their differences, they were always together. Side by side.

That's where the two found themselves that afternoon, lounging next to each other in their shared room's bay window. Riley was flipping through photos on her phone, a goofy grin spreading over her face as she compared each selfie the two had taken.

"I can't believe people get us confused sometimes," Riley said, flicking past a photo of her and Robyn waving peace signs at the camera. "I feel like we hardly look alike." Riley paused to zoom in on their faces, catching the glint of Robyn's blue eyes next to her brown ones.

"Well, we are fraternal. And you can't blame people for being a little thick. I mean, people hear the word 'twin' and immediately substitute it for 'clone'. It would be nice to switch places sometimes, though. I could use your math skills every now and again," Robyn noted, already tapping the like button on Riley's seconds-old Instagram post.

"And I'm sure the art department would love to see me paint something other than a purple cat," Riley giggled, looking up at Robyn's smirk. "But even if we were identical, we wouldn't do that. That would be cheating."

"Oh come on, Riles. You can't even have some imaginary fun? Tell me you wouldn't love to be me and see how the guys act when you're not around. If we were identical, you could walk straight up to any of our friends and get them to spill all their secrets without even trying." Robyn sat up, suddenly excited. "Like imagine if you did that to Lucas. It certainly would've helped your silly triangle situation go by quicker, right?"

"Maybe, but it wouldn't be honest. And I think us being honest with each other is what makes us such great friends in the first place," Riley beamed.

"You just know you're a terrible actress," Robyn said, leaning back on her elbow.

"That too," Riley admitted with a shrug. "But if we're talking secrets, whose would you want to know?" Riley asked. Riley had never been one for gossip, but she was always interested in mysteries. Since Robyn could be quiet, Riley always took every opportunity to get a glimpse of what was going on inside.

Robyn considered this for a moment, looking up at the now-ancient glow in the dark stars the girls had decorated their ceiling with when they were young. Not long after Maya had crawled through their window for the first time, the three of them had decided that New York's night sky just wasn't cutting it anymore. They'd been learning all about space: stars, comets, galaxies, and planets. Of course, that's when Riley found her Pluto. But Robyn had always been fond of Mars, the raging red planet, always wondering if life could be possible there.

"Would you wanna go to Mars someday?" She remembered her young self asking, pointing up at the little red globe swaying in the air conditioning. "Ya know, like if you were a astronaut or somethin'?"

"I don't know," Riley said, squinting up towards the ceiling. "Isn't it pretty far away? What if I missed everybody?"

"I would," Maya said proudly, hands on her hips. "I'm not afraid of any adventure. And if I got lonely, I'd just send out a big flare that you two could see from the bay window."

"Maya on Mars," Robyn sang. "A real big adventure!"

Robyn couldn't help but smile at the memory, even if the planets hadn't been up on the ceiling in a long time. "I'd pick Maya," she said finally. "no contest."

"Well, I'm flattered," a voice said from behind her. Over her shoulder, Robyn turned to see Maya climbing through the window. She slid over closer to Riley so that Maya could have a spot. Maya slid in next to her, a teasing grin on her face. "Talkin' about me?"

"No!" "Yes!" Robyn and Riley said in unison, then turned to glare/stare at the other.

"Very nice," Maya laughed, dropping the subject. "So, here's the deal. I saw you two were still free on this beautiful Friday evening, and I just so happen to have three tickets to see Mixed Moonlight. Tonight." Maya said, waving the tickets at the girls. "Cute caption, by the way. '#twinning', very original." Maya nodded in mock-seriousness.

"Mixed Moonlight? Are you kidding? I love them. Like, top ten local bands, no contest. Maya, how did you score these tickets?" Robyn asked, inspecting them like she could hardly believe they were real.

"I know a guy," Maya said, clearly amused.

"Well I'm down," Riley said.

"Great, starts at ten."

Without having to look, Robyn mouthed "It starts at ten?!" with a fake-horrified expression exactly like the real one on Riley's face.

"Yes, Peaches. So that means we're not asking permission from your parents, okay? Think you can handle that?"

"I can handle it!" Riley said, crossing her arms. As she sat that way, her face twisted in pain as if she was trying to hold her breath.

"Riles, if you can't handle it, you don't have to come," Robyn sighed, knowing her sister all too well.

"No, no, I can be just as cool and calm and collected as the two of you can. I've got this, guys. Stealthy Riley has arrived."

"Well, would stealthy Riley like to come to the living room for dinner?" Topanga asked, appearing in the doorway.

As Riley turned red, Maya quickly shoved the concert tickets back into her pocket. Thankfully, Topanga didn't seem to notice. "You're welcome to join us, as always, Maya. And Robyn, whatever it is that's upset your sister, please fix it. Like, now." Topanga said, turning to leave as Riley sucked in a huge breath. Riley stood up, turned to face Robyn and Maya, smiled bashfully, and then ran off toward the living room.

Maya turned to Robyn, waving the ticket in front of her. "You and me?" she asked, one pair of blue eyes meeting another.

Robyn grabbed the ticket, more excited than she could say. "Definitely."