isekai 2

uhuhuhu so i keep thinking about isekai and the multiple fathered litters. like how after archer was lovingly made into the experimental guinea pig but everything went really well! and how it was casniki’s turn after and he unsurprisingly made it look effortless. while shinji was like, content in his nature to be supportive and affectionate with them it didn’t stop him from feeling jealous and wanting that sort of fulfillment and attention for himself. it just like, threateningly simmered in him until he saw archer and casniki and their cute puppies and everyone doting on them to bring it to an unstoppable boil. shinji doesn’t see any reason why he can’t be filled with everyone’s puppies and why he can’t get all of that attention and love and praise — without it he feels like he’s less of an omega and less important than the others. of course, the alphas are hesitant to breed him like that because he’s a lot smaller than the others, but that doesn’t do anything to stop shinji’s feelings. in fact, it just makes him feel worse because there’s nothing he can do about his size. he’s just more determined to prove them wrong at this point. his sadness and longing and desperation are palpable at this point, where it’s affecting the alphas and archer and casniki, too. they know shinji can’t help it and that feeling inferior (even if no one else sees him that way!) is eating at him, even if they still have reservations. eventually the demands of his emotions and body are too much for alphas to withstand, so after all of the puppies are asleep everyone takes him to another room and immediately everyone begins smothering him in affection until he’s panting and pliant with his limbs slack pupils completely blown out. there’s a sense of euphoria about him now that “it’s finally happening” and i think making sure that his body isn’t too tense with excitement is their way of hoping this will be easier on him.

being with shirou is relatively easy, because it’s familiar to shinji. while shirou isn’t small by any means, he’s always been slow and gentle with shinji because he’s so inwardly afraid of hurting him. the thrum of rough alpha desires is like, vibrating just below his skin and he feels like he’s always doing his best to keep them suppressed enough so that he doesn’t harm shinji — it would break shirou’s heart if he did. (he saves that merciless, carnal roughness for archer.)  he might be painstakingly cautious until he knots shinji and loses himself in the blissful relief that comes with that, but is fast to administer aftercare. they’ve always been loving and more than a little vanilla in their coupling and they’re both okay with that.

cu is a little rougher than shirou simply because that’s always been his style — he’s never been one to hold back with much of anything, though even he is conscious enough that he doesn’t want to hurt shinji. i imagine that he isn’t much bigger than shirou, but maybe his knot is. and unlike shirou, cu knows that shinji wriggling and crying underneath him while they’re locked together is out of pleasure and that a little pain is perfectly natural. shinji is small, but cu knows he doesn’t always want to be treated like he’s made of glass. and when shinji collapses from his knees onto his stomach, cu holds him close and bites down on his neck while he empties himself out into him.

there’s a bit of an intermission when they roll shinji over onto his back and start kissing him and nipping at him — his face, ears, neck and chest. they tell him that he’s doing so well and he’s going to be so cute full of everyone’s puppies. telling him how they’re all going to take such good care of him! shinji feels cloudy headed and slack jawed, only able to purr at being kissed and teased at and whine at the sensation of leaking what he considers to be very precious semen. no one else seems to be particularly concerned, however, and they all continue to whisper encouragement at him and tease his ears and nipples while cu lifts his hips and makes sure he’s decently stretched.

shinji’s body is limp but trembling when strong hands pass him to much stronger hands. taniki really can’t help but look shinji over with a sense of trepidation about ruining something so small in comparison to him. still, he’s an alpha, and the overwhelming scent and emotion of an omega that’s so desperate to be bred by him easily takes effect. they’ve all had serious conversations about this before — even though he suggested only breeding with cu and shirou, shinji was adamant about carrying taniki’s puppies as well. even carrying his puppies separately wouldn’t do, because shinji wants to be treated in the same manner as archer and casniki. it was important and taniki wants to respect that, even knowing it could amount to a great deal of trouble for shinji, the sensation of breaking an omega’s heart seems more painful and troublesome over anything else. it’s one of the hardest thing for an omega to recover from and it’s a factor that really changed his feelings on breeding him.

taniki slowly licks into shinji’s mouth, feeling a deep purr rumble from his small chest to his throat. overloaded with pleasure, it’s impossible for shinji’s body to conjure any sort of tension, even when taniki pushes his fingers into him
in an attempt to stretch him further. even taniki knows that nothing can truly prepare shinji’s body to take him. that’s why he’s avoided mating with him until now. they’ve had a lovely relationship at every other physical level — taniki would be lying if he were to say that he isn’t satisfied that he finally gets to fuck him. of course he’s excited. he cares for shinji. he just cares for him so much he doesn’t want to hurt him badly.

shinji is breathless and squirming before he even realizes he’s being lowered down onto taniki. with sharp teeth grazing down his throat and into the crook of his neck, his nerves have been zapping him with pleasure from all directions until he feels that very distinct pressure. rather than stretch shinji agonizingly slow, taniki opts to bite down on his neck and flood his body with pheromones and euphoria as he pushes into him and bottoms out completely. the cry that wrings itself from shinji’s body is a confusion of pleasure and pain, and they continue from there with taniki’s large hands guiding soft hips and teeth firmly locked into skin. he growls, pleased from the very base of his nature and shinji whines, knowing beyond the haze overwhelming him that he’s finally getting what he’s wanted so much. even though he’s so tight and he feels so good, taniki keeps his wits about him so he doesn’t ruin shinji’s body from overuse. in the back of his mind, though, he hopes that they can do this again. (shinji does too.)

no one could have really done anything to prepare shinji for taniki’s knot. it’s exceptionally hard on even archer and casniki — just one of those unavoidable things. shinji’s purrs at the sensation of being filled quickly warp into cries of distress at the pressure and stretch being so, so much that once they’re locked together taniki gently takes shinji from his lap and positions them on the ground, shinji’s trembling legs hooked over impossibly broad shoulders. the others are there to kiss his tears away and hold him steady when his body wants to thrash in alarm. he gets bit over and over in succession to calm his body into limp jelly while taniki tries to suppress his own feral growling as he begins to fill shinji.

shinji feels impossibly stretched. overfull. heavy. it’s as if taniki might never stop filling him. he heaves a wet sob, even though he doesn’t want it to stop. even though it’s painful, shinji knows this is the sensation of success that he’s been craving. he feels love radiating from taniki in the same manner as everyone else. even though they aren’t locked together any more, taniki keeps shinji in the same position for a while to keep him from spilling out. eventually shinji’s breathing evens out and though he’s still actively crying, he feels so connected to everyone that he hopes they can stay like this for a long time.

when shinji wakes up again, he’s disoriented. it takes him several moments to realize that he’d passed out while connected to taniki. archer and shirou are dutifully cleaning him with warm, wet towels and shinji looks up from tear-sticky eyes to see his head is resting in taniki’s lap. the only sound that rasps from shinji’s throat is a pained moan that feels so disconnected from how pleased and satisfied his nature feels. he’s slow to realize how deeply his body aches. his lower half is throbbing to the point that he can’t even feel his legs, and his insides are so overstuffed that his stomach is puffy. he feels overstretched in every sense and his writhing under the sensation of it only makes that feeling multiply exponentially. still, he can’t accept this discomfort as unwanted. even while he sobs pitifully at the state of himself he has zero regrets. it’s exactly what he wanted.