A/N: Childe is trans. AFAB language used to refer to his junk.
Zhongli has put a lot of thought into its making.
He smooths his fingers over Cor Lapis, considering it. It glows gently under his palm, a natural reaction to his divine nature. He is no longer an Archon, but he is still a god and stone is his whim underneath his long and nimble fingers.
The request was simple on the surface. "I want you to make something to—well, you know," said Childe, a little awkwardly, wringing his fingers in his lap. His cheeks were pink and it was hard to look Zhongli in the face. "I—whatever you want. I want you to—It's for you."
It will be for both of them. That is the approach that Zhongli took when crafting it.
Zhongli spent hours shaping it, pulling the stone long and curved, smoothing it round into the perfect girth. He is no leather worker, but he did research. The straps are thick and sturdy, but the grain is soft to prevent chafing. The length of the stone slots into the harness snugly. The heft is delicious.
Later, when they are settling in for the night, Zhongli is not nervous.
Childe is, knees pressed into the mattress as he holds the stone cock and harness loosely in his hands. "This is…"
"You said to make what I wish for and so I did."
Childe laughs, short and aborted. Wistful, even. Surprised. "I just expected—"
"What?"
"Something more?" The stone cock that Zhongli has crafted is simple, average in length and girth, with a gentle curve just under the tip to provide a good angle. Childe smooths his thumb down the shaft.
"Why would I need something more? It isn't about the cock, it's about you. I want you, and so—" Zhongli gestures vaguely at the contraption. Then his voice softens. "If you have changed your mind, we can do as we normally—"
"No!" Childe says it so eagerly that he turns red in the face. He takes a deep breath and stands from the bed. "I just meant—no, I want to…Yeah. This is good."
Zhongli watches as Childe steps into the harness, dragging it up his legs, adjusting it around his thighs and hips. It is a sight, the way that the leather pulls at his skin, just barely sinking into the soft muscle, digging in. Childe pulls at it, checking the straps. The cock hangs from his groin, thick and heavy. Teasing.
"Ajax." His voice is quiet. Probing. Childe looks at him and Zhongli lays back in the bed and uncurls himself, spreading his legs to show off his half-hard cock and how easily he enjoys this.
And that must do it. Childe's mouth falls open and his pupils widen. He licks his lips, eyes trained on Zhongli's cock where it twitches against his stomach. He moves quickly, crawling over the mattress, the stone cock bobbing as he leans.
Childe settles between Zhongli's spread thighs, dragging his fingers across them, nails trailing the skin and leaving gooseflesh in their wake. Zhongli slips—into the feeling of it, the sheets, weighted underneath Childe's affectionate gaze.
They typically use their hands and mouths. It is good—it is perfect, watching Childe fall apart underneath his old and ancient hands, drowning in his cunt for hours. Or Childe's mouth wrapped around his cock, lips stretched obscenely as he swallows it right into his throat.
Zhongli was surprised when Childe brought it up.
"Wouldn't you want to take a cock? Isn't that your preference?"
"My preference is you," was Zhongli's simple, heartfelt answer that left Childe's lip wobbling.
And so, this night starts much like the others, Childe hanging over him with a lustful gaze. His calloused hands drag down Zhongli's sides before wrapping around his thin waist. They kiss with a clash of tongues and biting teeth. Zhongli nips at him, suddenly impatient because this is new and exciting, and for a man who's lived eons those moments are rare.
"Ajax," he moans. Childe's hand is hot on his cock as he strokes it, spreading around the precome for a slicker, wetter glide. Zhongli bucks against Childe's palm, seeking out friction.
"Gods, you're always so—" Childe groans, tipping his face into the crook of Zhongli's neck. He licks across his skin, breath warm as he nips it. "So gorgeous," he finishes, trailing kisses over the line of Zhongli's jaw.
Zhongli angles his head, baring his neck for better access. Childe sucks mark after mark that he knows won't last longer than a few hours. But he loves them, small blooms of purpling skin. Childe will trace them in the hazy afterglow of their lovemaking. Zhongli fucks into his hand, whining softly. Childe chuckles as he leans back, gaze slipping down for a better look.
He lets go of Zhongli's cock, letting it slap back against his belly. He sweeps those calloused fingers down the seam of Zhongli's balls, rolling them and squeezing them, watching as they draw up tight with his arousal.
"Zhongli," he says, watching him in awe. Those fingers trail down further, pressing firmly against his perineum. Zhongli's gut clenches as pleasure flares, and he moans, head tipping back, eyes fluttering closed. "I love that you want me like this."
"As if I couldn't. As if I wouldn't—Oh."
Childe drags a thumb over his hole, spreading an asscheek with his other hand. And then he pauses, that devilish smirk spreading across his face as he regards Zhongli. "What's this?"
Zhongli is too old to be embarrassed, so he just watches back. He hooks an arm underneath his knee and lifts a thigh, showing off his hole that's already slick and loose. "I'm impatient," he says, unabashed. "You cannot ask me to design and make you a cock, and then not expect me to want it. Immediately."
Childe presses two fingers into his hole, sinking them right to the last knuckle. They slip in deep, easily, searching around in his wet and warm heat. Zhongli keens, arching against the bed as Childe fucks them in and out, curling them against that damned bundle of nerves.
"Still so tight, even as you suck them in," marvels Childe, spreading his fingers wide, testing the give of Zhongli's stretched rim. A third finger presses in beside and suddenly, Zhongli is a writhing mess as Childe fucks him closer to the edge.
His cock twitches. It aches, begging for release, leaking precome all over his belly. "Ajax, Ajax—"
Childe kisses his sternum, nuzzling the sweaty flesh there. "I want you to come on my fingers first."
"I want, I—" Zhongli doesn't want this to feel so one-sided but it's hard to think with Childe's fingers stroking his insides, bullying his prostate with feverish intent. "Please," he says, unsure what he's even asking for. "I don't—not yet, not yet."
"It's alright," coos Childe. "Come for me, Zhongli."
The pleasure snaps in his gut as he comes, spilling all over his stomach and clenching around Childe's fingers. Childe fucks him through it, lazy thrusts of his fingers dragging over his insides as Zhongli tenses underneath.
"Ajax, Ajax—" Zhongli whimpers when Childe finally pulls his fingers free. He spreads his cheeks, looking, and Zhongli feels his hole struggle to clench around nothing, gaping at the loss.
They shuffle around. Childe slicks the stone cock with oil, his palm glistening. He hesitates, looking at the harness, taking in the Cor Lapis that glitters in his hand.
Zhongli watches him with a half-lidded gaze. "I designed it for the both of us. If you press against it, you'll see—"
Childe wiggles the harness around, grinding his hips against it, and his mouth falls slack as his clit brushes the textured side of where the cock sits. "Oh," he whispers, pressing a hand to his lips, testing it again. "Oh, that's—"
When Childe looks at Zhongli again his gaze is ruddy with arousal. "You're perfect, aren't you?" he muses as if he can't fathom that Zhongli would make something with him in mind as well.
"Fuck me," replies Zhongli, hooking an arm around Childe's neck and pulling him close. They kiss again and Zhongli swallows his ragged breaths. He sweeps his tongue over Childe's teeth, his tongue, the roof of his mouth.
"Okay," says Childe against his mouth. "Gods, yes, okay." He fumbles with the cock, pressing the cold tip to Zhongli's loose rim. It catches, just barely slipping in. Childe rolls his hips slowly, sinking into Zhongli's ass.
It's cool against his hot insides. Rigid, like the constructs that they use occasionally, but it feels different when attached to a body. Zhongli cries out, fingers curling into the sheets as Childe bottoms out.
"Celestia above," curses Childe, "look at you." He watches Zhongli's ass swallow the cock greedily, leaning back and dropping a hand. He thumbs over the swollen rim where it's stretched around the length.
Zhongli moans, head tipping back, eyes fluttering closed. It feels amazing, pressing in all the right spots, the gentle taper of the length dragging right over his prostate. "Move," he begs, egging Childe on. He hooks a leg over Childe's hip, forcing him closer.
Childe chuckles, grinding in and pulling a moan deep from Zhongli's throat. His hands slot against Zhongli's hips, gripping tightly. He pulls Zhongli into every unsteady thrust as he tries to find a rhythm.
"You're doing so good, so, so good—Wait, there, there—" Zhongli whines, meeting his thrusts. Childe holds his thighs back, keeping the angle, fucking right into that bundle of nerves that sets Zhongli's nerves on fire.
His cock is hard again, leaking, dribbling thin spend from its tip. Zhongli trembles with overstimulation as he tumbles towards a second orgasm.
"Fuck," hisses Childe, rolling his hips, grinding his cunt against the leather harness. He moans. His fingers dig into Zhongli's waist, nails leaving marks. Utterly debaucherous. Zhongli can't stop staring, watching how Childe leans back, biting his lip. "Gods, I wish I could feel—but it's, it's—"
Childe keeps fucking him. Quicker, faster, heavier thrusts as he finally figures out the right motions that do the best for them. The cock is thick in his ass, resonating with his Geo the same way any other stone does. Zhongli can feel it in his pulse, in his veins.
And the way that Childe watches, cheeks flush, eyes half-lidded and libidinous with want. "Archons, I love you. Zhongli, I—fuck."
Zhongli can imagine how slick he is, wetness streaking the insides of his thighs. Childe presses the heel of his palm against the flat of the harness, just above the stone cock. Grinds against the pressure, loosing a breathy sigh. He fucks Zhongli earnestly, his name tumbling from his lips.
"Ajax, Ajax, don't stop, don't—" Zhongli comes again crying out, writhing and pulling at the silk sheets. His come is water and thin. Tears cling to his eyelashes as Childe rocks into him, coaxing him through his orgasm.
Then Childe slips a hand between the leather of the harness and his skin, pressing his fingers to himself, circling and stroking them until he finds his own release. He comes a moment later, thighs trembling between Zhongli's legs as he falls over the edge.
"Oh, gods," he moans, and Zhongli just melts into the sheets, clenching around the stone cock as he imagines Childe's fingers dragging through his own swollen folds.
They are left, breathing heavily, their orgasm thrumming in their veins. "Ajax," says Zhongli for what seems to be the thousandth time.
Childe slips the cock out carefully. "I'm—that was—"
Likely affirming in a way he never thought possible. Zhongli's affection chokes him, watching Childe kneel there, a beautiful cock laying between his thighs. Suddenly, a different sort of heat burns through him.
Zhongli sits up, reaching out to tug at the leather harness around Childe's hips. He undoes the buckles and pulls at the straps, the contraption falling away. Zhongli tosses it to the side and flips them, pressing Childe's back into the soft mattress.
"I'm not done with you," he says, kissing Childe's neck, nibbling at the skin carefully with slightly sharper than-normal teeth.
"Oh?" Childe raises an eyebrow. He tugs on a lock of Zhongli's hair before brushing it behind an ear.
"You were so good to me," says Zhongli. "And so, it is my turn to be good to you." He drags a hand down the length of Childe's chest before spreading his legs. He's beautiful, his cunt on full display, swollen and slick.
A kiss to Childe's collarbone, his navel, the crease of his groin—and then Zhongli loses himself all over again between those powerful thighs.