And Red hasn't shrunk yet.

"May I, Master?" Red asks as she puts her hand on your butt.
"Sure," you tell her. You give her butt a bite on the way up, as she rubs your face against it again.
"Ooo, careful, Master! My butt is for a variety of things: spanking, jiggling, fucking, licking, rubbing...but not biting!"
"OK, I didn't know." You give her a hard smack instead, which is really loud.
"Oh! That is going to leave a hand print, Master," she tells you as she looks over her shoulder.
"So?" You smirk.
"So, I'll have your hand print on my big butt, Master, to show that you own me."
Then, she is a doll again, sitting in front of you on the couch. Her tail looking thicker, and a blue hand-shaped mark on her left buttcheek. You put her back on the table with the other.