RWBY Shrunk/Transformed

"No. This has to be a dream" she thought, "How could this even happen?" She forced memories from the night before into her mind, but nothing seemed unusual. Jaune made them play a boring farming game, Weiss brought icecream, Nora got everyone to drink a mysterious drink she got from a creepy gypsy lady, what could have caused this?

Ruby's pondering fell short as she suddenly noticed the giant, bare ass of her sister from across the room. "Wh-what!? Why is Yang naked?"


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"I wonder if these are clean" Yang asked no one in particular as she picked up a pair of golden panties from under her bed. "It's probably fine, it's not like anyone's going to see them." She put each leg through their respective hole and slide the panties up, the back being swallowed up by her exceptional rear. She opened up her drawer to pick out a bra for the day. Not really paying attention, she grabs a matching yellow one and pulls it out.
But little does she know, someone has taken residence in there.

Who is it?