>>1813680all right, motherfuckers i tried, i think it worked, pic related
first things first we need to prepare this shit, so while using pmx editor erase everything in the i-19 model that is not the body and everything in hestia's model that is not her head and save them as separate pmx files
pick up i-19 's body , increment the body's size in 1,03 and save it
now pick up hestia's head, reduce her size in 0,99, erase a few vertex on heher neck (the first "ring" pic of the left), and move the next ring to your heart's content, since the purpose is to reduce the gap that hestia's neck and the i-19's body will have
now save the new head, and open i-19 body, and here import the head and move it closer to the 19's neck, but not so much since the result would be a short neck hestia,give some space.
now, select the body and select the two vertex "rings" move them up, towards hestia's neck (middle pic)
and to to finish we need to make the body's color matches hestia, what i did was simply pick up a part of the face's texture and save it as a separate file, then put it as a sphere and then select the"x multiplication sphere" option (you can also use this with a brown square and you can make the girls brown without editing the texture)
the result should be like the right pic