Echoen: *the battyherm nods sagely, even as shi pins you beneath hir, grinding to that phat mousie rump*

Boo3: this is acceptable to me
Boo3: *moans almost absent-mindedly as you grind against hir booty, the soothing rhythm melting away any resistance to anything whatsoever*

Echoen: *Chrring, shi mounts over a curvy multimouse, aligning our bodies pleasantly together, hir large and heavy bulk mashing to your backside.

Boo3: *the extra-endowed mouse slowly closes hir eyes as shi begins moving in response to your grinding, as if a gentle wave is building in hir body and moving from one end to another in time with your own movements, each gyration causing hir to slide against all of your relevant bits.*

Echoen: *Soon, shi has hirself laid completely flush against your back, hir large breasts pillowing to your shoulders and head. Dragging hri broad hips over your bottom, that dark, meaty spire of hir shaft grinds and slides across your sex. "I'm going to fuck you into the form I desire..." Shi rumbles into your ear... before unceremoniously, rigidly, and far too immediately sheaths the entirety of hir heavy cock into your pussy, a knot bloating fast to lock hir within you.

Boo3: *the mouse lets out a reflexive squeak, hir bidy tensing up, going rigid for just a moment, squeezing just that tiny bit tighter around your fat knot before relaxing once more and letting hirself adjust enough to experience the blissful sensations you're inflicting on her. "Ohhh...please do," shi mumbles, slowly pushing hir hips back against your groin and clenching hir walls around your shaft once more. The bulge you're making in hir stomach reaches up past hir lowest set of breasts. If you went at hir, you'd get a titfuck at the same time...*

* Echoen chrrrs, sliding hir arms underneath you, both of them tucking around your waist and hands splaying under your belly, feeling hir shaft pulse and twitch within your nethers and belly. Hir biceps pushing against your second set of breasts. Shi wraps each hand around one of your shafts, just holding them. Hir fat balls resting heavily atop your thighs. A heat enters your belly.... pushing down and growing out, as a heavy, *big* pair of white-furred testicles push out between your thighs, fattening underneath hir own nuts to lift them up. The pleasure redoubling as a second pair of balls push into your sac as well, all four churning with obscene productivity, causing your cocks to leak from the sheer pressure.

Boo3: *it seems you're pumping some extra energy into the changing mouse below you as shi starts to gently writhe underneath your bulk, hir new, bloating, increasingly productive sac sending a rush of potent new hormones through hir. Shi slowly grinds hir hips into your hands, coaxing just a bit more cum to leak from hir turgid, oozing cocks. Hir nipples grow more sensitive as hir arousal grows, little trickles of milk starting to leak from hir oversensitive teats, moistening the ground below hir as well as your strong, firm arms as you continue your sexy, penetrative, transformative embrace. Shi can't help but wonder what else you might have in store for hir, beside the massively arousing double set of testicles you've recently gifted hir with.*

Echoen: As you writhe, shi begins to thrust and grind slowly, twisting and pushing at your perky bottom even as you continue to change. Shi nuzzles into your soft neck, sniffing deeply of your scent and nibblign just a bit, churrring deeply in hir arousal as your tunnel clenches tightly across hir knotted prick. Hir legs are aligned with yours, so there's not so much of hir body touching the ground - and less, a heat fills your thighs and streaks down your legs to your feet, and they all begin to.... inflate, as the best term. Thighs thickening, your hips nudging slightly more broadly wide, making room for your testes even as your legs pump with fertility. Your toes and plump pink mousie paws begin to plump and swell, suckably smooth and as pretty, pink and big as any footpaw fetishist could love. All of this most certainly means your ass is blossoming, rumpcheeks filling and rounding out into the sluttiest, breedable whore shape. Everything about you from the waist down is blissfully overgrown, and you'd stand taller than the batty now, even with your disproportionate upper body. To match your balls, though... your shafts have been growing, swelling longer and thicker, pushing up along hir arms to hir forearms.

Boo3: The mouse lets out a sustained moan as shi feels hir lower parts rubbing against each other more and more, hir flesh pumping and plumping up, more and more of your weight resting on hir until finally all of your mass is supported by the bloating, changing rodent herm below you. Shi bucks back at you slightly, squeaking with delight as you bounce up and down hir squishier form. The fact that hir throbbing, expanding shafts are rubbing against more of hirself aas well as you doesn't hurt any, either, the steady stream of cum issueing forth from hir twin cocks, courtesy of hir bloated, ultra-potent balls is strong and forceful enough now to force hir cocks into a semi-erect state through the urethral pressure alone, even with how much more room them have to accommodate a much bigger release as well as their significantly increased weight.

* Echoen begins to thrust and drive at you more, now, plunging back and forth within the buttery depths of your sex and against your juicy, swollen rear end. Both of hir paws stroke your shafts, slathered in your slippery seed. Hir own sac grinding and sliding against your eternally churning nuts. The same changing heat flushes into your sex, causing you to clench involuntarily around hir girth as your womb... mutates. Your belly swelling and rounding out as your womb grows heavily, riddled with ovaries. Your cunny aches as *two* new pussies push down from your womb, opening up to either side of your original cunt. Breed. Sex. Mate. Breed. Breed. With these changes, the hormones within you go mad, and you're absolutely sure that if you're left alone for any extended length of time, you'll knock yourself up by sheer fertility alone. Just *what* you'll give birth to... you feel a twinge, and get the sense that if given the opportunity, you could likely reproduce any kind of offspring you could want.

Boo3: the mouse rolls hir eyes up as the sudden, blissful realization hits hir and sends hir into a miniature orgasm, further aided by your latest, most intense gift to the rodent to date. As the hormones pumping through hir increasingly perverse and productive body swamp hir brain and drown out all non-sexual thought shi had left for a good while hir addled mind turns towards future possibilities and current wants. Oh, the way you're stuffing hir is just the absolute, absolute best, but with hir new, tight, virginal pussies and eager, eager wombs shi wants, no, needs more. More of you, fucking those pussies like you're fucking the original, shooting your hyper-potent, transformative cream right into hir, flooding hir in all the right ways, sticking to the insides of hir tunnels and uterus and fallopian tubes, relentlessly grinding and mashing yourself into hir, not stopping for even a moment.
And then something clicks inside hir and as shi feels hir tummy tremble and hir brand new ovaries ache with the most delightful ache shi knows shi'll get hir wish very, very soon. Oh, shi'll have more all right, but so should you. It's the only way to properly repay you for what you've done, oh yes...

* Echoen squeezes around your middle, bucking more and more firmly, driving down against you in proper *fucking* motions, nuts slapping together. Shi lets, encourages your corruption further, plunging that hot middle snatch even as the others weep needfully. The mutagenic warmth rushes up from your belly, and it feels like your lungs are inflating in a big breath. With the same sensation, your four big breasts blossom bigger, flooding with flesh. Your upper body expands to match your lower, milk gushing from productively fat teats.

Boo3: your rodent plaything pants delightedly, squealing and squeaking and moaning as hir entire body evens up into a new state of voluptuousness. Hir hips enthusiastically buck back against yours in time with your own relentless, forceful thrusts, causing hir entire body to jiggle and squish here and there, the pumping action forcing out gushers of milk from hir swollen, over-full chest in regular squirt, approaching a gallon in volume with each fresh squeeze. Still not satisfied, however, hir brand new wombs prepare to fulfil the mouse's mad wishes, hyper-fertile eggs firing up inside hir ovaries, releasing, bumping into each other and nearly crackling with fertile energy, somehow managing to seed the increasingly greedy mouse with two sets of twins, each in their own womb, all of them modeled after you. Their rapid development goes undetected for the time being, your perpetual ravishing of the mouse's body having distended it so much that any pregnant bloat would be difficult to detect, even for full-size offspring.

Echoen: *Redoubling hir efforts as you provide the intense pleasure shi seeks, hir potent hips POUND into you, ravashing and relishing your gulping, buttery cunt, popping hir knot in and out of your sex again and again and again. A shudder, yet shi doesn't stop even as hir seed begins to flood into that middle main womb, swelling you with hir quart-sized loads blast after blast. Hir breedmouse, hir fuckmouse, hir toes curl and squeeze your ankles as shi stuffs balls deep into your snatch and unloads again and again. Yet, even as shi does cum... those broodlings within your secondary wombs have already grown mature enough to birth, and they push out against hir thighs and sac, still growing evenv as they emerge.

Boo3: Your mousie grunts with mixed pleasure as you fill hir up all the way, ravishing hir depths and emptying your possibly endless supply of transformative, ultra-virile spunk into hir most eager and least occupied womb. Beyond some extra-firm, unorthodox squeezing of your cock inside the mouse, neither of you manage to notice your double twin dopplegängers as they push their still-maturing way out of the mouse's extra wombs. Not until the deceptively strong children (although they've certainly grown a lot to still be called that) wrap their arms around your own waist and push you into the rodent's still-greedy twat, your tenacious little swimmers now completely unable to escape and making their collective way up through hir fallopian tubes to wreak sexy, permanent havoc on the rodent's ovaries, teasing and entering every egg shi has available and knocking hir up thousands of times over.
Silent but with a knowing glint in their eyes, your doubles, now nearly as big as yourself, split up into two groups, two holding you against and inside your mousie lover, plugging hir up as you keep unloading and bloating hir belly with slower-growing but more radically altered and potent offspring, while the other two lick their lips and line up their own rigid, throbbing, oozing shafts with the very holes from which they just emerged. The mouse grunts and squeals with incapacitating lust as soon as the first drop of hir strange offspring's gummy pre drips on hir distended labia... and then you feel the pressure, twin pressures, actually, knocking at your proverbial door, as the twins restraining you prepare to return what you did to their mother a few moments ago, with interest.

* Echoen clutches around your waist and massive hips, grunting and panting in the blissful pleasure of unloading into a corrupted fuckmouse, something that is near and dear to hir loins. Amidst hir orgasm shi indeed does not notice the battymice that push from your sexes... until they push atop hir! Shi gasps and shudders in surprise, groaning as they shove hir hips down hard at you, so far that hir knot jams into you again and even hir sheath kisses your nethers, hir cockvein bloating fatly as hir cum unloads into you so heavenly powerfully, promising you endless breeding. Whimper groaning, shi's squeezed at, shoved at, and piled around as hir two near-clones stuff against hir and thrust into *you*, further pinning hir against your backside as shi feels their cocks stuffing into the tunnels next to the one shi's fucking. And then hir *own* cunny is probed at, as shi's mounted by hir daughters, forced to stretch around their girths as they plunge into hir firmly.

Boo3: Your daughters waste no time at all as they start up fucking your own pussy. They don't push in simultaneously, they alternate, meaning your cunny is always stuffed full of hard, throbbing, slick, veined cocks sucking and rubbing and grinding at your inner walls. They piston back and forth, back and forth, picking up speed as they go along until their mother's flesh jiggles with the force of their thrusts being transmitted into hir through you. Their pre and their cum is no less potent or transformative than yours, and you're getting a double dose of the stuff as your daugher-sisters aim to reward you handsomely for making their lives possible. If you thought what you did to your fecund mousie was something, you'll be amazed at what's in store for you, although you're beginning to form some idea as a tingle starts to spread through you.
Your other doubles, meanwhile, are busy eagerly fucking their nearly insensate mother, the mouse's breasts already starting on a new change in response to this sudden triple dose of transformative jizz, as well as the after effects of you impregnating the rodent's middle, original womb so spectacularly and, not to mention, absolutely permanently. The mouse's nipples bloat and swell, the milk leaking from the teats getting progressively thicker and creamier, until finally it becomes clear that it's not milk she's "lactating" anymore at all, something backed up by the fact that aside from merely swelling and bloating, hir nipples are beginning to take on a very distinctive, recognizable shape. The hugely pregnant fuckpile of a mouse now sporting an eager quarter of leaking dick-nipples.

* Echoen cries out against your back as shi's ravaged, savaged and fucked so nicely, plunged full of swollen dick and heaped full of bliss as they pound hir without abandon. But most of all, the aching heat, the sensation of transformation, alteration... it spurs hir to orgasm even harder, too excited for what's to come. Below, your mutations continue, and your nipplecocks quickly spill out from your nipples... and form  heavy, soft testicles beneath them, perfect for any would-be drinker. You can feel the batty's belly swelling round with cum and life, and the two herms plunging into hir squeeze against hir sides and take hir own nipples into their muzzles, to drink their fill and further improve themselves. What concerns hir almost as much as hir beginning changes, though... is that all four battymice look decidedly pregnant themselves.

Boo3: the mouse's vocalisations have turned into delighted gurgles and moans as hir entire body has become so overproductive and overwhelmed with lust that any other noises are simply too much effort, effort which could instead be spent on enjoying the ongoing sensation of transformation and getting railed by god knows how many hyper-endowed herm bats with semen so potent it could turn a man into a heaving hermaphroditic ball of self-love and knock him up from across the room. Hir tail, just about the only slim thing left about hir, now swells up obscenely at its base, the thickness spreading and tapering out towards the end. The heavy thing lands on your shoulder with a meaty "thwap" and even in your daze you see a slit opening in the fat length, a drooling, hard cock slowly emerging from it, stretching the slit around it in, it seems, much the same way as a thick cock stretches a pussy. In fact, the slit does indeed look like a puffy, taut labia stretched around a throbbing, oozing cock.

Boo3: Your daughter-sisters glance at each other knowingly and simultaneously bite down on your nipples, causing you to yelp out in surprise. A perfect opening for a thick, dripping tail-cock to hide. The moment it crams its foot-plus long into yourself, instantly releasing a creamy load straight down your throat and into your stomach. The addition of mousie tail-cock cum to your tummy seems to have been some sort of tipping point. Gone is the pleasant tingle, to be replaced by an incessant, orgasmic buzz, making it impossible to tell which parts of the body are currently transforming. You feel your own immense cock surge in length and girth, eliciting another gurgle from your forcibly tied rodent lover. Your sheat bulges and stretches and swells, growing taut until two more shafts spring forth, slapping heavily on the mouse's backside, shooting thick wads of cum into hir fur that are almost immediately absorbed. Your breasts throb as they rapidly swell, filling with more milk than you can easily get rid of yourself before dividing, leaving you with four breasts, then dividing again into eight massive, swollen milky tits, each at least three times the size of your head. Your daughter-sister-selves take hold of one shaft each and guide them into the slavering wet pussies that have only just formed on your mousie slut as a result of hir increasingly radical transformation.
And if that's not enough, your semi-doubles intensify their fucking further as they go into labour...