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"Doing so good, Moonie."
"Ssshut -" Moon grumbled into his hand, desperately trying not to make eye contact with himself in the mirror, cutting himself off with a whimper. "Shut. Up."
Sun laughed in their shared headspace. "But you are! Look at you, so wet, spread so wide so I can see. Thank you, Moonpie."
Moon's voice hitched, a little crackle, embarrassed as he watched (for Sun's benefit, thank you very much) his hips buck into his hand at the praise. He gave his cock a couple of rough pumps, struggling not to squeeze his eyes shut because Sun would be so upset if he missed even a second.
"C'mon, Moonbeam," Sun cooed, and Moon shuddered. "That hole of yours looks so desperate for attention, and I'm so sad that I can't do it myself.
"Won't you?"
Moon sighed, giving himself a nice squeeze at the base before deciding yes, he could use a good fingering right about now. No, he wasn't doing it because Sun asked, so sweetly, wishing he could push his own fingers - separate fingers - into Moon's sopping wet, sloppy, desperate cunt -
Moon made a noise as his middle and ring fingers sank into his heat, a little gurgle, watching in the mirror, rapt, as his hole stretched around them. Sun groaned, the sound seemingly reverberating in their head, and it was like his voice was the only thing Moon could hear.
"Oh, good boy, taking it so well. Look how easy that was."
And Moon was shaking, pads of his fingers pressed against his ridges. He didn't even think he could move; this already felt so good.
"S-Suuunlight, p-please -"
"I know, I know, sweetheart, but you can do this. Don't you wanna fuck yourself for me?"
Moon whimpered, melting - because he did, so badly, but he wished even more that Sun could really touch him, make him cry and whine and arch on his own, fuck him so good that he still felt loose the next day.
"Y-yeah, yesss," Moon sighed, and his very first thrust made his legs shake, spread wider, especially when Sun hummed, sounding so ridiculously pleased. His cock wrapped around his wrist, going wherever the best friction could be found, and he hunched over himself, overwhelmed. "Hm - S-Sun, SSSun -"
"Yes, just like that," Sun whispered, enraptured. "Please, please, just a little faster, hm? Wanna hear how wet you are. Yes, so beautiful, so handsome."
Moon cried out, fucking himself just how he knew Sun would want to, the filthy sound of his slick and his little noises the only sounds in their room, and god, he was embarrassed, but it was so good. He covered his eyes for a moment, just a second, forgetting himself in the cacophony of good, and Sun whined.
"No, no, Moonie, please let me see, let me see, want to watch you come, need to watch you -"
"Oh, mmmsorry, Sunny, sssooorry -"
And Sun's moan when he focused back on his hole, pushing in a third finger as an apology, was sin incarnate.
"Yeah, yes, pound your pretty little hole, just for me, all for me."
And that just about did it.
"A-all for - yyyooouuu -" Moon gasped, back arching inward, curling toward himself, struggling to keep his eyes open and on the mirror as he came, AI losing control of his voice box, a cacophony of white noise and a glitchy, stuttering hum reverberating through the empty room as he fucked himself through it, thighs shaking and spreading wider, chasing that feeling, cock tightening around his wrist like an anaconda - and Sun couldn't stop talking.
"Yes, all for me. You're so perfect, Moonie, made for me, for each other. So gorgeous, especially all sloppy like this, coming all over your pretty fingers. Wish it was my cock -"
"Sunny, Suh - n-n-n - ny, Sun, pleazzzzz -"
Moon's body stuttered, then froze, steam pouring from every available orifice, overheated.
His fingers were still pressed deep in his hole, and Sun made a happy little noise in their headspace; one he was still sure Moon could hear, rebooting as he was.
"My Moon," he said, gentle, like a soft caress. "No one will ever know you like I do, y'know? And that's okay, because you're mine. And I'm yours."
Moon couldn't respond, but Sun knew he understood. Knew that what they had was special; theirs and theirs alone.
Even if they couldn't touch each other.