Balros & Echoen
Thinking of Gadget, of her, of you, in so many sexy ways and potentials.

LlunaBlue
She's tappity-tapping away on key keyboard as graphs and numbers fly about on the screen, busy nerding out to you as you're leaning lovingly over her shoulders
"Ah! Y'see, your brand of mutations are characteristic of temporal physicality shifts! You can clearly see what I mean if I sort the probabilistic density variables of body parts by popularity, and then click on Live Demo here and-WHEEEAAGH!"
You're suddenly given a rollercoaster ride as the mouse gal's upper torso violently elongates, generating copies above and below themselves and rendering her as just a helplessly lengthening tauric mousetipede.

Balros & Echoen
He's draped himself there upon her request - more responsive than a coding 'rubber ducky', warmer and nicer smelling, too. His eyes were all but glazing over from the technical jargon - so he's really taken for a ride as your mousebody LURCHES upwards as a full upper torso grows from where your neck used to be. He clings to your shoulders and new set of arms, his footpaws on your old shoulders. "A-ah! Gadget, what was.. oh no!" He squeaks, feeling fat rapidly plumping into your multiple midriffs, heavy girl guts unmistakably rotund with rapidly advancing pregnancies

LlunaBlue
"AAAAAHN...! O-oh dear, I can feel them... I can hear them! A-and... oh no, I might've overcalibrated this simulation for cringe humor!"
Her uppermost paws clutch her uppermost belly as her uppermost legs spread wide, allowing her swollen cunnylips to shove two new Gadgets halfway out...
"UHHHNNF-! Oh GAWD I wanna FUCK...!"
"Ehe, but we're siblings, so not me, right?"
"... >:3"
"...But n-not me, right??"
Meanwhile, mousepuss no. 2 births a pair of arms holding a Subway first and foremost, before eventually a very moody-looking Gadget emerges... but not for long as her sister drags her back inside, denying her the enjoyment of her sandwich.

Balros & Echoen
Balros sink himself slowly, intentionally, down onto his pregfat mouseherm girlfriend's gorgeous cock. Feeding your shaft into the clenching depths of his insanely soft, bottomless depths of his pert squirrelboy butt. His own boner is smooshed into the softness of your swollen midriff, nudged upwards by the firmness of how fucking pregnant you are, partially hidden from view by your huge milky breasts. "I'm... mmhh. Thinking about why I am so into having a girl-herm's penis in me, feel her cum, and cum and cum. Feel how /her/ shaft throbs and aches and -needs- to ejaculate again and again from balls that are driving her crazy with lust for me."