Extend the Story - Add a Room

You finally break the silence with a question that has been haunting you since this whole escapade began.
"Why is Cindy doing this to me?" You ask with great curiosity, but still with clear insecurity in your voice.
"Cindy kinda has a split personality. Well, there's no 'kinda' about it. She has a condition called Dissociative identity disorder, or D-I-D for short." Your former self would've probably made some sort of joke about the condition, but, because of your new found shyness and the fact that you are forced into situations with this girl, you listen eagerly. "She literally has two personalities. One is particularly spiteful and would probably do anything to get back at anyone who pisses her off, with interest. Although holds her allies close, she doesn't not value them as friends, so she wouldn't exactly risk her life for us. The second however is very different. She would joke around with you, not trying to cause physical harm. She would probably call you names and encourage you to do things you wouldn't normally do. She is also quite friendly and greatly values friendship, unlike her alter-ego. Something you may wish to know for future reference, she's...kinda addicted to sexual contact and wouldn't hesitate to have sex with someone. When she is 'on the outside' she prefers to be called Cinders. You just happened to meet her and have her switch personalities in the same sitting, that would explain her keenness to help and her harsh response. Either that or she's on her period." She giggles at her own joke.
"But..why this?" You ask sitting up, presenting your breasts.
"Oh, well, you refused her help, because of her sexuality, didn't you? She probably thought it would be amusing to show you what it's like..and make it much worse. Then again, it maybe just that Cindy wanted to kill you, but Cinders prevented it. Lucky you, huh?" She tries to cheer you up.
You do not have time to respond. The bathroom door swings open. Cindy is stood their with her hand on her hip.
"Well, speak of the devil and she will come." Lizzie smiles to you, but you resist smiling back to avoid further punishment.
"I'm holding a meeting. Bring the slut with you." The mentally unstable girl declares.

Go along with it. Remain obediant and nothing will happen to you, right?