Does Nicole notice that the rulebook is gone?

Yes, but it doesn't matter.

Nicole goes back to her desk and pulls out a textbook. As she's picking up a highlighter, she looks over her desk with a perplexed look. She searches every inch of the desk, checking to see if she missed anything. "Hey, where did the rulebook go?"

Her face lights up with anger. "That bitch! She must have seen me using it and took it! I'm going to-"

She stops. "Well, I guess I can't do anything. After all, she's the Sorority President. She's allowed to take whatever she wants."

There's a knock on the open door. The blonde who had been studying chemistry earlier waves to Nicole. "Hi! Sorry to bring bad news, but President Cindy said she wants your servant."

Nicole sighs. "Oh well, at least you got the room mostly clean before she claimed you. I'm kind of sick of torturing you for your disgusting habits, anyway. She can have a turn."

The blonde girl leads you down the hall until she points to another room. "This is Cindy's room." You start to go in, but then she stops you and says, "Wait, no, not here, dummy! The Sorority President's suite is on the third floor." She leads you to another door.

You go through and climb the stairs. When you get to the top you see Cindy sitting on a couch in her personal living room. She's looking through the rulebook, holding a pencil. She looks up at you. "Oh good! You're here! This is going to be so much fun! Go ahead and kneel in front of me!"

"Come on!" you object. "I'm a servant, not a ****."

Cindy looks amused. She quickly leafs through the book, erases something, then writes one word. She looks back up and says, "Aren't you supposed to be on the ground?"

"Yes, mistress!" you say as you fall to your knees in front of her.