Description done By  Skinth

As Undyne’s smooth lips grace the scaly snout of her cold blooded scientist girlfriend-
They inevitably, flush bright red, and fall over!
...firing the prototype ray directly into Undyne!
In a mere instant, their eyes pop wide, pupils warping into a bright pink heart shape! Their vision swirling into a pink-hazed bubbly lovedream, while their puckered lips BALLOON out into blubbery, drooly smoochers- now permanently locked in a drooling, sucking pucker! Their fiery red hair blimps outwards one all directions, becoming a poofy bimbo ‘do while the sluttiest blonde color pours down through every follicle, disguising every last vestige of intimidation-
Complimented by slutty pink stripes, of course.
Their small, almost non existent eyelashes extend into whorish parodies, fluttering and fluffing up into thick bedroom eyelashes-
And finally, their clothing, battle under armor, rapidly warps into a prostitute’s dream-
Fishnets, spaghetti strap top, all bright garish pink-
Finally ending in their eyepatch swelling into a shiny rubber heart patch!
All throughout the transformation, the warrior fish’s mind is rapidly drained into the single digits of iq, while their concealed underparts flourish into insane levels of sensitivity, clouding out every single thought with sheer, unabated lust-
For her reptilian partner; who could only look on in a mixture of horror and secret arousal as their dominant warrior fish is melted into a hilariously oversexualized sex object.
The lust of the fish, only matched by the arousal of Alphys herself- who had a secret, but massive, fetish, for just such a thing~
Seeing the smooching face of their bimbofied lover looking over them, they decide-
They won’t be undoing that ray’s effects anytime soon~
Or, for that matter-
EVER.