They're flying.
Holy fucking shit, they're flying. Casey's walked in space before, but this is a whole nother level--no cables, no suits, just the wind ruffling through her hair as clouds brush past her skin, beading drops of moisture on her hoodie. The only thing to ground her is April's hands in hers, calloused palms pressed together as they sway above the city.
When April had drifted down from the clouds like an avenging angel, eyes glowing brighter than the crystal floating around her neck, and asked if Casey wanted to see something cool, Casey's first thought was that's fucking insane. So of course when April had held out a hand, she'd reached for it without hesitation.
Now here they are, up among the clouds together, and the terror simmering low in Casey's gut only makes it all so much more exhilarating. April sends them swooping through a cloud and she laughs, tinged with hysteria. April laughs back, a sound so beautiful it almost hurts.
"Don't look down," she whispers, so of course Casey does. And wholly shit, the city looks like a blanket of stars spread out beneath them, like the universe has flipped upside down and the sky is under them--she yanks her head back up with a gasp.
"You okay?" April asks, but there's a bit of a smirk at the corner of her mouth, one that Casey's seen cropping up on her more recently. She doesn't always know what to make of it, but right now, with starlight reflecting off clouds to glimmer in April's hair and power crackling through the air around them, it teases a little burst of heat to life in Casey's stomach.
She tries to hide it by rolling her eyes. "You're such a dick." She carefully tugs her hand free to try and give April a playful shove on the shoulder.
April's arm blurs, a hair faster than normal, fingers wrapping around Casey's wrist. She lets out a yelp as she's yanked to April's chest--to April's breasts. Oh me, oh my, oh fuck. The stone is almost painfully hot between them, pressed up against Casey's stomach, and for some freakish reason it turns her on even more.
"Ape--"
"Shhh," April hums in her ear, running her fingers lightly across Casey's spine. "It's okay." Her lips press against Casey's neck, warm and hungry. 
Casey sucks in a sharp breath and April giggles. "You like that?" Her ankles rub delicately up against Casey's, legs wrapping around each other. A finger delicately teases Casey's waistband.
"Uh, Ape?" Casey glances around at the clouds and stars swirling around them. "You do realize we're kinda...vertically challenged right now, yeah?" They've fooled around some before, but never in such a...unique position.
"I know," April murmurs. "The question is, do you really want to go back down?" Her hand reaches down to nudge and pull at Casey's panties, her fingers shuddering with power against Casey's bare flesh.
"Shit," Casey breathes. April kisses her again, this time with a hint of teeth.
"You feel so alive right now," she whispers. "I can feel it, Case. I can feel you." Her hand tugs gently on Casey's hair, pulling her head back enough to plant a soft kiss on the hollow of her throat. "You'd never let anyone else take control of you like this, would you? But you'd do it for me."
And it's terrifying that's she's right, but again, it's the kind of terror a part of Casey loves.
So she just smiles, because two can play at this game. Casey rolls her hips with a soft grunt, grinding up against April's crotch.
"You like that?" she teases.
She's rewarded with a soft gasp, a fresh pulse of power swirling through the clouds against them. Then April's pushing back, their intertwined legs rocking together as their clothes tangle and hook, rubbing against Casey's cunt as it starts to grow slick and hungry. 
Fuck, it's like they're literally dancing on air. Or humping. Whatever.
"I wish you could see yourself as I do," April sighs. "You look like a lightning storm, love." She digs her fingers into Casey's hips and drags her close, until it feels as if the crystal will sear itself into Casey's flesh like a promise. "Bright and wild and ready to burn down the world."
Her finger runs across Casey's cunt, nudging at her clit, and then it pulses. Casey lets out a strangled gasp, jerking forward almost against her will.
"Like that?" The pulse comes again, and again, until Casey can barely hold on to April's shoulders with white-knuckled fingers. But she keeps thrusting her hips with gritted teeth, drawing in strangled breasts as they rise higher and higher into the sky.
"Crazy, Ape," she rasps. "You're fucking insane."
April just laughs, a laugh that rolls into a moan as Casey viciously bites into her shoulder. She pushes up against Casey, and pushes in a way that sends sparking tendrils of power arcing through both their bodies, need and want and feeling arching back and forth with every thrust of their hips.
Casey's shaking, babbling curses, because that's all she can do when it feels like you're being touched by the holy. She can barely tell up from down undermine, if they're dancing across the clouds or standing atop the city. And right now, she doesn't really care.
The first of tonight's orgasms arcs through her like a shooting star. April's mouth drinks down her cry, those impossibly bright eyes filling her vision, and Casey's world is engulfed in the most perfect kind of white fire.