"Students, if I could have your attention please!" Professor Windsor said in a commanding tone of voice. "I am pleased to announce that the subject has agreed to move on to the next stage of the lecture... Anal stimulation."
The audience were getting more comfortable as the lecture went on and there was applause from several of them. Louise felt proud and embarrassed that they were all excited to see her be used anally for the first time.
"Now, an important part of anal sex is preparation. Some people don't mind some mess, but if you want things to be clean you will need to prepare first. As the subject wasn't expecting this today, it will likely not be clean inside, so we will need to clean it out."
"No!" Louise exclaimed. The professor turned off the microphones again and leaned in to speak to Louise.
"Do you remember what it is you need to say if you'd like to stop, darling?"
"Yes"
"What is it?"
"I - I - I know what it is but I don't want to say it." Louise whispered.
"And why is that, subject?"
"I want to continue"
"Okay we will continue then and you will be receiving an enema in front of this audience, unless you use your safe word. Do you understand?"
"Yes, Professor"
"And when do you use your safe word?"
"At any point if I need or want anything to stop."
"Good girl" She turned the microphones back on. "Thank you for your patience everyone. As I was saying, we will clean the subject internally by administering an enema. If you yourselves need to clean anally, you can buy a douche as an easy, cheaper alternative, however as I have the equipment, today we will do an enema."
The professor, rolled out a large enema bag, hanging from a stand.
"Another major part of anal sex is lubricant, to avoid pain and help things move easily. I will add a water based lubricant to the enema nozzle and to the anus."
Louise gasped and gripped onto the examination table as she felt a gloved finger rub lubricant over her anus.
"Are you ready, subject?"
"Yes, Professor"
"Okay. I will now slowly push the nozzle inside."
"Ooh! Ahh!" Louise was humiliated at making any noises, knowing that every person in the room could hear her over the speakers, but she couldn't help it. This feeling of her arsehole being invaded was completely new to her.
"Relax, sweetie. There we go, the nozzle is inside. It is only thin, however it can be a very strange sensation the first time, so it is important to take things slowly. I will allow the subject a moment to adjust before turning the water on. Here you can see the subject clenching its anus around the nozzle, getting used to the feeling."
Louise groaned at the humiliation of everyone seeing her exposed and vulnerable.
"Okay, I will now turn the water on. How does it feel, subject?"
"Weird" Louise whispered almost imperceptibly.
"Please speak up, so everyone can hear."
"It feels weird, Professor. I've never felt anything like this before."
"Yes it will feel strange and you have a lot more water to take inside of you still."
"Oh god."
"Let's help the subject, by providing a distraction shall we?" Louise felt her nipples being rolled between the professor's fingers again. "I will place the nipple clamps on again, this time a little tighter."
"Ouch!" Louise felt her first nipple getting squeezed painfully. "Fuck, owww!" Her second nipple was now stinging too.
"Whoever had the remote earlier, please pass it on to someone else who would like to stimulate the subject."
Louise heard a slight commotion, it seemed that several people were trying to gain control of the remote. Whoever won control was not hanging around because soon her nipples were vibrating very intensely. She was very glad for the distraction as her stomach was beginning to cramp.
"Students, we can now see the subject's stomach is becoming a little distended from the water."
"Please, Professor, I can't take any more water."
"Shh, shh, you can, you're doing really well. We will stop soon, for your first enema, we won't do too much but you can take a little more."
The nipple clamps had been turned down to a light buzz and now all Louise could think about was the pain in her stomach and how desperately she felt like she needed to go to the toilet.
"I have turned the water off now. The subject is sufficiently full. Now subject, I will remove the nozzle and you will hold the water inside you, do you understand?"
"Yes, Professor" Louise was very nervous, not knowing if she would be able to keep the water in. What she didn't realise was that the professor had already put a large container underneath her, to catch any water that may come out.
The subject felt the nozzle being slowly pulled out of her anus, as the end of it eventually popped out, the Professor quickly pressed against Louise's anus, helping her keep the water inside.
"Well done, subject, you only leaked a little. Now keep squeezing, I don't want you to release yet. Shuffle down the table, good girl."
The professor adjusted the table so that Louise was partially sitting up. The movement made the clamps pull down on Louise's sensitive nipples.
"Please, Professor, I really need to release."