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Adrian knew their mates had realized they'd been acting weird.
Ever since Grace's first Heat with them, there was something Adrian couldn't shake. Their squishy, leaky little Omega had looked so good, all filled up with theirs and Rocky's eggs. Adrian had been a little sad that it had been outside of Rocky's and their own fertile periods, GraceMate would've looked even better carrying their brood. They knew that was something that could come another time, after a conversation with their human mate (and maybe a Thrum, they had no idea how well Grace would hold up for the gestation period, and Adrian was not risking their softprettyleaky mate's life for anything), but still. The image of Grace all round with their nonviable eggs before they'd had to help him pass them had been good.
Which brought them to their other fantasy, one they'd had in the afterglow (as Grace called it) of that first Heat round.
Grace hadn't had a Heat since then, only a few false ones. Grace had said it was normal as his body adjusted to being healthystrongbeautiful again. It would be a while before he became regular again, but they didn't need a Heat to make their mate leakysquirmpathetic.
But Adrian hadn't been as participative as before, they were waiting. Rocky had asked, but had been placated when Adrian informed him that they had something special planned for their mate.
Grace, however, wasn't pleased.
Adrian hated making their mate upset, but they knew he'd enjoy the outcome of his wait. Which was finally at an end. Adrian didn't necessarily mean for it to fall around the time Rocky was pulled away to the other side of the planet for a project, and they knew they'd owe him big big big time for it, but it had been a while since AdrianGrace had time to themselves.
Adrian almost couldn't contain their excitement as they put on the new xenonite suit RockyMate had made for them. They had to take a moment to regain control before they set out for GraceMate's house. It took longer than a moment, as they had a small problem that was quickly becoming more insistent.
They were so full of eggs.
Adrian had passed up many cycles for this moment, they couldn't risk ruining it before even getting their Omega on their ovipositor. They wanted to see how roundprettysweet their Grace could get, how much he could take like a good little Omega, how much he'd leak and beg for more.
Adrian needed to focus.
It still felt pointless to knock, considering they could see through the walls they'd built for GraceMate, and it was, technically, their nest too, but humans and their privacy. They knew he'd be home, it was the "weekend," as Grace had called it, and if he wasn't jogging on the beach or exploring the artificial forest, he was in his nest. Grace's sweet voice called out before opening the door, seeming almost surprised by the taller Eridian at his doorstep. Surprised, but not displeased. Maybe he wasn't as upset as Adrian thought. They did love how expressive their human was, though.
"Adrian! I thought you would be with Rocky at the build site?"
Adrian "shook" their carapace, a human trait they'd picked up from GraceMate and RockyMate over the years. "No. Only Rocky requested. Adrian remain here with GraceMate. Adrian have surprised for Grace. Adrian come inside, question?"
Grace looked even more surprised, but his features softened with his teeth bared in a "smile." It had unnerved Adrian at first when they met, but now it was endearing, especially knowing it was a sign of happiness from their human. "Of course, Adrian. It's your home too, come on." He said while stepping out of the way. Adrian deeply enjoyed the shiver their mate gave as they dragged a claw against his hip while entering.
Grace closed the door behind them, unable to hide his curiosity. "What sorta surprised do you have for me, Ri?"
It was endearing, the nicknames their mate gave his Eridian partners. Grace had mentioned that it was a sign of affection between partners and people one cared about, and it was an Earth custom they found enjoyable. Especially with how Grace reacted to some of the nicknames they and Rocky gave him. Particularly in bed.
Adrian also enjoyed the way Grace's heart rate picked up under their attention, the way his breath hitched as they dragged a claw slowly, teasingly up his inner thigh. "Adrian not been as attentive with GraceMate. Apology. Adrian been planning something special for little Omega. Plan is ready now."
It was something both they and Rocky deeply enjoyed, how leakyleakyleaky their mate got even outside of his cycle. Grace's cunt clenched and slick began to soak his underwear, heat rising in his cheeks as Adrian's "fingers" pressed over his entrance through his clothes in a slow, torturous grind.
It took Grace a second to remember how to speak, his hips pressing against his mate's claw to get more of that delicious friction. It wasn't like Adrian had been ignoring him lately, but he had noticed (and worried a little, his low self-esteem making a brief comeback) when Rocky had been the one mainly dominating the bedroom. He'd worried if maybe his Heat had put Adrian off, despite them still being present and active in other ways during sex. He'd be willing to forgive if Adrian fucked him rightnowplease, but he could be placated with knowing why Adrian had been so distant.
"What... what sorta plan you got, Adrian?" He asked, breathlessly. He'd long since learned not to be embarrassed about the sounds his mates pulled from him, but he would deny the pathetic little whine he let out as Adrian stopped touching him.
Adrian just chuckled and gently pushed Grace towards the bedroom. "Grace undress and get in bed, be a good little Omega, yes? Then maybe Grace get present."
Maybe it was a little undignified, how Grace just scrambled to do as he was told, but damnit. He'd missed Adrian, the way the taller Eridian would hold him down and fuck him better than any human Alpha could. If Adrian had been planning something that required blueballing him like that for as long as they did, he knew whatever his mate had planned had to be well worth it. Adrian wasn't one to tease like Rocky was.
Grace didn't understand it himself, why he still continued to wear clothes. Especially as they refused to come off in his hurry. It wasn't like there was anything no Eridian hadn't seen before, with their echolocation, and Adrian could keep the biodome in a condition comfortable enough that he wouldn't need them to regulate his body temperature. Maybe he wasn't quite ready to become a nudist, but he was seriously considering it as his underwear got caught on his ankle.
Adrian was slower to follow, taking their time and enjoying the desperation coming off of their mate in waves. They really had made him wait for it, hadn't they? They'd make sure to make it up to him soon enough.
Adrian purred in approval as Grace finished wrestling with his clothes and lay out on the bed, on his back and legs splayed wide to show off his dripping cunt. "Pretty pretty pretty Omega." They purred, their ventral seam beginning to split so their ovipositor could descend.
Grace shivered at the praise, even more slick pooling beneath him as he felt a xenonite-covered claw press against his entrance. It must be a new design, because he swore he could feel more of his mate than before. Their heat leaving a delicious trail on his skin and in his core. His hips canted up to give his mate more access, a whine leaving him as Adrian pressed a finger inside to work him open at the invitation.
Adrian cooed, using their free legs to crawl onto the bed over their mate. "Poor Grace, starved for my touch. Leak so much, is Grace sure it is not Heat?" They teased.
Grace's cunt clenched around Adrian every time he was afraid they'd leave him, shivering at the towering Eridian above him, making him feel small and protected and safe. His Omega hindbrain preened at it, so happy to have his Alpha back. Tears pricked at his eyes as he squirmed on the bed. "Missed you, Ri."
Adrian pressed another finger inside their mate. They'd found that prep was shorter during a Heat, and they missed that, as they were getting desperate themself, but they didn't want to hurt Grace. "Apology, apology, for the plan to work, could not fuck the sweet Omega. Had to keep it all inside, let it build."
Grace's hands found the arms braced on either side of him, running his hands over the smooth xenonite. His little Omega cock was hard and leaking against his stomach, sweat already building on his forehead and chest. It had been too long without Adrian, and only his remaining brain cells and curiosity kept him from begging to be fucked through the mattress (again). "You- fuck- you still haven't told me the plan?"
Chuckling, Adrian's ovipositor descended fully, brushing against Grace's knee and earning a shiver from the human. "GraceMate looked so good, so full of RockyAdrian clutches during his Heat. Adrian could not help but wonder what RockyAdrian little Omega would look like, filled with many clutches."
Adrian had hit something devastating inside Grace before he could really comprehend what they said, back arching off the bed as he pressed his hips down in an attempt to fuck himself on Adrian's claw. It took a bit of effort to get through the haze, but what Adrian had said earlier, coupled with something Rocky had told him years ago about Eridian egg cycles (and how backed up he'd gotten during the months on the Hail Mary to avoid frightening the human with a display), clicked with him eventually.
Slick all but gushed out of him at the thought.
"You..." Grace breathed, legs falling open further as Adrian's ovipositor drew a slow, wet, teasing line up his leg.
Adrian nodded, pistoning their fingers inside their mate. "Adrian put off many cycles for this, want to see little Omega get softroundbred. Grace let Adrian breed him, question?"
Did he even need to ask?? Grace knew consent was big with his mates, but he needed Adrian and their eggs in him last week. "Yesyesyes. Grace let Adrian breed him, statement."
Adrian chuckled at their mate's desperation, though they were no better themself. Pulling their fingers free, they used two claws to pull Grace's legs apart and up. "Hold here, command."
Grace shivered but did as he was told, hooking his hands around the backs of his knees and earning a coo from Adrian. "Good boy."
To this day, Grace didn't know if it was a good or bad thing that his mates had found out about that particular kink. Today it was a good day, his hindbrain insisted, especially as it earned him a fleeting touch of Adrian's ovipositor at his cunt. It wasn't enough, but it was more than what he'd gotten in a while.
"Adrian, baby, please don't tease." Grace didn't know if he'd survive it after all that time; he was so empty, he'd almost swear that finally having his Alpha's hands on him again was going to send him into an early Heat.
Adrian gave the Eridian equivalent of a tsk, keeping their ovipositor positioned at his slick cunt, but never breaching. "Little Omega gets whatever his Alpha gives. Beg for it." They may be as ready to unleash their eggs as Grace was to receive them, but they still wanted to hear the sweet sounds their Grace could make for them.
Grace whined, high and needy, as his head flopped against the mattress. Damn them, what happened to not being a tease? Rocky was rubbing off on them after all. Adrian was lucky that Grace was too horned out already to admonish them for it. "Please, I need it. Need you inside. It's been too long, Alpha. Need your cock, need your eggs. Needitsobadplease---"
Adrian cooed, their carapace shook as they finally, finally pressed inside their mates warmtightwet cunt. The moan Grace let out was nothing short of debauched, too, as that ache was finally settled the deeper his mate did. It always took his breath away, how much his mates filled him. Their ovipositors were nothing like human cocks, squishy and solongsogood. He hadn't much cared for human mates back on Earth, but even if he had, his Eridian mates ruined him forever. Adrian had so much to give, and he was always amazed at how well he took it. He knew it was something the Eridian deeply enjoyed, too.
"So good. GraceMate so good, taking Adrian's cock so well. Will fill you up, nice and round. Will give little Omega many babies, statement." Adrian sang, barely holding off the eggs that wanted to find a home in Grace's warm, safe womb.
Tears fell down his temples and into his hair as Adrian reached the deepest parts of him, making him so full and so complete. The sob he let out was filled with nothing but pleasure as Adrian fucked their ovipositor into him, slow and deep. Eridians didn't need stimulation like a human to reach completion, but it was something Grace's mates came to enjoy when they found out how much pleasure it brought him.
Grace had half a mind to ask them to fuck him the Eridian way at some point, just hold him down and use him as a cum and egg dump, uncaring of his own pleasure. Only theirs.
Adrian loved how good Grace always felt around them. The xenonite was the thinnest around their ovipositor to allow maximum sensation. There was a little hole at the tip for the egg transfer, but Adrian wished there were no barriers.
They knew they couldn't hold it off forever, they'd already held it off for far too long. As much as they enjoyed bringing their mate pleasure with a good fuck, they knew the little Omega enjoyed being filled just as much. They'd make up for all the missed time later, they promised themself. Adrian fucked Grace for as long as they could, giving him as much pleasurable stimulation as possible before the main event. They stopped, pressing as far and as deep as they could when they felt the first egg start making its way down.
"GraceMate ready for babies, question?" Adrian cooed, dragging their claws through the messy hair of their mate's head.
Grace shook, still holding himself open wide for his Alpha as he felt the first egg travel down Adrian's ovipositor. "Yes, fuck. I'm so ready."
It was like the dam broke, and once it started, it couldn't be stopped. Not that either of them would've wanted to.
It was a visceral relief, finally letting go of the clutches they'd been holding onto. The first egg opened the door for the rest. Without a Heat opening him up, it had taken Grace's body a second to accept it. Once it did, the rest followed more easily. Adrian shook and cooed as they felt and saw their eggs pass into their Omega's body.
There were eggs of varying sizes, some no larger than normal and some a tad smaller. Grace assumed it was due to how long Adrian had been holding them in, Rocky had demonstrated something similar on the Hail Mary. Beads of sweat clung to his body as his cunt greedily clung and clenched around Adrian's dick, his belly growing heavier with Adrian's brood.
Then Adrian did something with their ovipositor, and the eggs were dragging right over his prostate.
Grace let go of his legs to throw his arms out, one hand clenched in the sheets, and one clinging to Adrian as his orgasm tore right out of him. The way he clamped down hard on Adrian's ovipositor caused a few eggs to enter him in rapid, forceful succession. He screamed, thankful he'd made his mates make his nest soundproof so all of Erid wouldn't hear him get fucked, and trembled as the eggs just kept coming.
Grace's orgasm eased the way for more eggs to enter him, Adrian noted happily. They keened at a pitch too high for their human to hear when he clamped down on them, and more eggs began to pass through. There was a lot to give, too.
With the sensation of being filled so thoroughly and the eggs continuing to drag over his prostate on their way to his womb, it wasn't long before Grace came again. It felt endless, and as Grace began to teeter towards a third orgasm, he let out a short sob. He felt so full. "Adrian, I can't-"
Adrian petted Grace's hair with a soothing sound, another claw passing over Grace's growing tummy. "Yes, Grace can. Grace can be good Omega, take all of his Alpha's babies, statement."
Grace whined as his third orgasm rocked him to his bones, his nerves on fire in the best way. It had long since passed the normal amount of eggs he noted Adrian and Rocky passing in a single clutch. He didn't know how Adrian had kept all these eggs inside them for so long, and they weren't finished. Grace didn't think he'd have space for any more, but his body found a way. Just as eager to be bred as his hindbrain.
He was made for this, made to take their eggs.
Grace teetered over into overstimulation after the fourth orgasm, but it was still in the good territory of it as he took the torrent of eggs like a champ. Adrian had seemed to lose focus beyond giving Grace everything they had, beyond relieved to empty their aching eggsac into their Omega's waiting womb. Grace caught a few words here and there from the blueish green Eridian, his own brain too much like putty to translate, and Adrian too far gone to stick to the vocabulary Grace was familiar with. "Good, sweet Omega," "Look so pretty pregnant," and "GraceRockyAdrian babies will be beautiful" were some of the things he caught.
Just as Grace was about to tip into bad overstimulation, the eggs finally started to slow down. Adrian had enough sense of mind to move their ovipositor so that the remaining eggs passed cleanly through, giving Grace's prostate a break. Once the final egg plopped safely into his womb, Adrian trembled and chittered silently as they "came" inside Grace. Filling him with their eggs and the sap-like cum that rounded out his belly even more.
They both stayed like that for several moments, Grace trembling and panting beneath his still mate. Just when he'd been about to plead mercy, Adrian slowly, carefully pulled out of him. Careful not to stimulate him too much, understanding through the haze of their own pleasure that he'd had enough.
Grace's limbs flopped uselessly onto the bed, his stomach a heavy weight pressing him down into it. He whined as Adrian's ovipositor left him, leaving him feeling oddly empty for how full he was. Adrian just cooed and gently scooped him up into two of their arms, crawling further up the bed to lay him down and curl around him, an arm draped carefully across his belly.
Grace mustered up the energy to look down, surprised by how his cunt clenched at what he found. He looked maybe four, five months pregnant. He couldn't see it, but he could feel Adrian's cum leaking out and making his thighs sticky. His sated, happy Omega hindbrain whined a little at losing any of it, but keened proudly at how well he'd taken his mate's brood. He really looked knocked up, didn't he?
Adrian vibrated softly and comfortingly as they gathered their human mate close. "GraceMate did so well. Look so pretty. Thank you for indulging Adrian."
Grace leaned back into his mate's warm, comforting embrace. His eyes grew heavy from exhaustion as he curled close, as much as he could with his belly in the way, anyway. Though he knew they'd eventually need to get them out, he was content to keep his mate's eggs in him for a bit longer, ignoring the pang of longing. Of wanting to keep them in him forever.
"Love you, Ri." He mumbled, dragging a hand over his belly. He fell asleep imagining it swelling for real with his mate's babies. Adrian's and Rocky's.
Adrian was imagining it, too, and they knew Rocky was as well when their mate returned halfway through Grace's nap to find them still curled together, Grace's belly still full and round despite leaking eggs and fluid for a while.
They'd need to call a Thrum soon.