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This is from an AU where Ira scoops up chuckableimp‘s teenaged Aloysha and Sylvertongue is an old Russian elemental dragon spirit who’s called dibs on Aloysha’s bloodline.
Using Lauren the Corgi’s Promptober list.
CWs: size difference, monsterfuck, oviposition, breeding, coercion, mpreg
***
The agreement was to let Sylvertongue breed a new baby zmei on him, in return for letting Aloysha stay. Ira agreed to those terms. But he didn’t expect Sylver to breed him in his natural form. The old wyrm is huge; his cock alone is the size of a man, and Ira’s gate strains around it as it fucks in and out of him, scaly ridges dragging along the insides. If he doesn’t pin Ira down against the ground, he’s just lifted up, the little human body that serves as his entrance speared on the thing.
Sylver laughs the first time this happens, while Ira dangles helplessly from the dragon-cock penetrating the gate in his chest.
It doesn’t strictly hurt, though. As a matter of fact…
So when the gate is open, Ira loves it. Being what he is can be terribly, hm, empty. There’s a sensual pleasure in being passed through. Something his human body might define as erotic, and it’s as good a word as any. Sylvertongue tests him. He can take bigger still–he’s a living portal, in a sense, size isn’t much of an issue–but Sylvertongue’s cock works him. It takes him and fills him and doesn’t let it end. It feels like a plundering, like Sylvertongue is reducing him to his essence in a way he so seldom gets to experience. The quakes of pleasure rock through his entire body till he can feel all the hidden outlines of himself.
It’s not just once, as Sylvertongue explains to him helpfully right after the first time. They’ll be doing this over and over again for the next several…oh, days, weeks, however long it takes. Sylver comes back and fucks him again and again over the course of days, weeks, pinning him down under a huge clawed foot and fucking into the otherworldly passage of him while Ira’s whole body quivers around him with eagerness to be used the way it was designed for.
He’s never been sure how big the…the other part of him actually is. He can’t exactly get eyes on it to make a comparison. Not as big as a dragon, he can be pretty sure now, but big enough to take a dragon’s dick. Big enough for the monster’s cock to thrust into him to the hilt and coat his insides with gallons of sticky, pearlescent ejaculate.
It’s not semen, really. If you’re being technical. It’s liquified elemental power. That’s what zmei are born from. Sylvertongue pumps him full of the sticky, heady stuff till he can feel it coating his every inner fold. Its energy calls to Ira’s own gately nature and they swirl together inside him till his head spins from it, even when Syvlertongue isn’t in the midst of fucking him blind.
He can feel it all stirring together inside him, somewhere down in his depths. He can feel it when it begins to glob together, starts condensing into…something. An egg, an embryo, made of a zmei’s magic and whatever weird twisty forces live inside the body of whatever Ira is on the other side.
Sylvertongue knows, too. Nothing shows in Ira’s human body, but Sylver laughs at the way it makes him wriggle, trying to settle the discomfitting sensation of a lump somewhere inside him where he can’t reach. It’s always there. He’s always aware of it, in ways he’s never been constantly aware of that part of his body before.
Sylver eats him out over it one time. Enormous forked lizard tongue plunging into his chest to lick over his interior and make him clench even tighter around it. He fellates Ira’s gate till Ira finds himself howling from the overwhelm, arching and scrabbling for purchase with limbs he hadn’t even known he had.
It can take quite a long time, Sylver smugly assures him. It will ripen slowly. It still has growing to do. Ira wonders uneasily how big it will be by the time it’s ready to be born.
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