"Your shirt fits me pretty nicely, Cass... but the bra's a bit too small. So... for your transformation, I'm turning you into a bra that fits. Yes... A black silk one, with a lace trim. You will remain fully conscious the whole time, and you will be able to, like, see and hear and feel everything. You'll be able to speak, too-- however, I'm going to make it so that I will be the only one who can hear you."
Cassie watched in horror as her arms began to flatten and meld together. She tried to stand, but she toppled over maladroitly. Looking down, she realized why: her legs had begun to merge as well. Within moments, her limbs were elastic straps; her right arm and leg formed the main back band, and her left arm and leg were shoulder straps. Soon the transformation had spread inward, toward the trunk of Cassie's body. Her hourglass figure became dramatically exaggerated as her torso and pelvis flattened and formed rounded cups, leaving her midriff as a thin elastic band between them. As she shrank down, her head was sucked into her fabric torso, reappearing briefly at her former navel before being formed into a bow. When it was all over, there was nothing left of Cassie but a seemingly inanimate brassiere-- and certainly no indication that it had ever been human.
"Perfect," said Erika with an expression of sadistic joy and satisfaction. She picked up Cassie and put her on over her bare breasts. Cassie fit very comfortably. "Yes, perfect," Erika repeated as she examined herself in one of the bathroom mirrors. "Hehe. This is so fitting for you, Cass. You've always been so supportive of me in the past." Cassie was conspicuously silent, so Erika continued, "Oh, please don't be upset at me, Cassie. I hope you understand. You're one of the lucky ones, because you get to be one of the first to serve me. And it's because you're my friend, that I've given you a role that you can hopefully enjoy, like, a lot. But this is far from over. I'm just getting started."