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For those who haven't come across the colored slimes in other parts of this Witch's Mansion storyline, pink slime makes skin sexually sensitive, green slime makes sexual attributes extra jiggly, and blue slime makes sexual attributes swell while they're being touched.
The way I figured these googirls would work in my head was that the pink and green ones could induce their effects by touch. The blue one needs to pump it into boobs/butts/lips/whatever to apply the growth by touch effect on them.
Admittedly, I'm giving them a couple other random abilities as well, like the blue googirl causing Robin's limbs to grow weak at a touch, but oh well.
I already have an idea for the first option, so if anyone planning on adding to this could leave that one alone, that would be great.