A Student

"I'm here as a student," Kasha replied cautiously. Something told her she shouldn't give this succubus the answer she wanted.

The secretary clicked her tongue in disappointment, and then snapped her fingers. Kasha was illuminated by a pink light for a moment, but she didn't feel any different. "You have now been registered as a student. This means the rules now apply to you. One of the rules is that I can only get my hands on you if you break the rules, or as part of a class assignment. I'm stuck here indefinitely, so please break some rules where I can catch you~ I'd love having an obedient pussy licker to keep under my desk~"

"What are the other rules?" Kasha asked, taking a step back.

"You will learn them as they become relevant. There are two I can tell you about now. First, you have a locker here which contains some items you may find useful. It can only be opened by you, so you don't have to worry about anyone getting into it~" There seemed to be a subtle threat there, but she continued before Kasha could process it. "And if you want to leave, you will have to pass three classes. One Introductory level course, one Intermediate level course, and one Advanced course. You are free to pick whichever you want from the available options. But be careful which ones you choose. Should you fail, you'll be condemned to an eternity of remedial lessons. On the other hand, should you manage to pass three courses, you will be able to leave here and challenge the final stretch of that dungeon. But it's been centuries since a mortal managed to escape, so I have high hopes that you'll be here forever~"

With that, she gave Kasha a wave goodbye and returned to some paperwork on her desk.

Down one hallway, Kasha saw a faint glowing pink light, her gut telling her that was her locker. She could check it out. Or she could head straight to a class.