At the way Mistress is looking up at her, crying, Ruby stops talking. "I... I'm sorry," is all she can say. Mistress walks over to her, her sobs getting more intense, as the witch winces and fidgets. When they stand just centimeters from each other, Mistress breaks eye contact, instead just staring at her eye level, the witch's breasts. Without warning, she hugs her.
"Oh, okay," says Ruby, putting her arms gently around Little Mistress as she cries into her catsuit. They stay like this until Ruby realizes her hands don't feel right. She raises them to her face and gasps.
"Wait... what?" Her hands are the same purple as the catsuit, and shriveling slowly but surely. She rubs them together to find that they squeak like rubber. "What are you doing?" she asks, and she struggles to free herself, but the little vampire is stronger than she looks. "No! I'm sorry!" But Mistress says nothing, and the change continues.
Before too long, the witch's legs as well as her arms are shriveling, and both are shriveling much faster. The new shape of her arms is becoming clear, as at the end of the intact portions now dangle lengths of frilly two-layer latex sleeve. Her legs are joining together as they wilt away, their remnants out into pleats. Now Little Mistress is holding her up. Her cape, as well, is retracting into the catsuit; it looks like all three, her arms, her legs, and the cape, will reach her torso at the same time. Ruby's starting to get the gist of what'll happen when they get there.
For her part, Ruby's quickly becoming resigned to her fate. She made her bed, and now she gets to lie in it. Or dangle next to it, or whatever. As the cape gets close enough for her to feel the air under it, she sighs. "Okay," she whispers.
The last part is quick. Frills appear up and down the torso as her head caves into the neckline. What's left of her body hollows out as the catsuit's zipper vanishes. The momentum in Little Mistress's arms causes them to jolt inward, and as soon as they do, she lowers them to her side, letting the Ruby-dress drop to the floor, her hat on top. Mistress continues to cry.
"Rimi. Rini," she says. "Get me another human. Try to find one... forgettable."
"Yes, Mistress," they say in unison, and they leave. Little Mistress dresses you up in Ruby and her hat, and spends the rest of her servants' absence crying, your inflatable head clutched to her chest. Soon they return, giggling, each under one arm of a single thin, pale, unkempt, bespectacled 20-year-old.
"Uh..." he says as he sees Mistress... "doesn't she look kinda... young?"
Those are the last words he'll ever speak. Mistress drops you and pounces, biting straight into his carotid. Rimi and Rini run as blood flies everywhere. Mistress laps and sucks until there's nothing more to suck, and lets the boy's corpse drop.
Rimi and Rini look over at Mistress in horror. In her eyes is pure bestial satisfaction, a smile plastered on her face, for a few seconds. Soon the smile fades, and again tears begin to run down her cheeks. She walks over to you and lays her head on your stomach, crying herself to sleep as Rimi and Rini stow the body in a hall closet.