Sarah, a girl who likes her butt well stuffed

Sarah was a very horny girl and she didn't bother hiding it: half her class knew that she occasionally came to the campus with a butt plug inside, she even showed it through her panties to a couple of her friends once. She liked feeling like a little slut, she had let two guys from a fraternity fuck her in a bathroom at a party, and she french kissed girls just for the thrill of it.

When she got the Rulebook she immediately started thinking about all the perverted rules she could make, but the ones she wrote first were

"New Rule: for 18+ girls anal stimulation is as necessary as drinking water"

"New Rule: anal is always pleasurable and safe for all girls, even rough anal without lubrication"

Just thinking about the effects of her new rules made her extremely horny. "How long will it take for the rule to take effect?" she wondered, she'd soon discover the answer.

During the last lectures of the morning the girls attending class were all quite distracted, each wondering their own unusual lust for anal, but the effects weren't yet too ****. Still a couple of particularly thirsty girls had gone to the bathroom to satisfy themselves; Sarah of course was one of those girls, but she knew about the New Rules so she went a little wild: somehow she managed to shove a whole can of coke up her butt. It felt fabulous, normally it would have been a little much even for Sarah, but thanks to the new rule she could pump the can in and out feeling only bliss. She had to get back to class, but still wasn't satisfied, so she pulled up her leggings leaving the can deep in her guts and headed back to class.

After the end of the class she headed back to her dorm and there she decided to take the can out, but she couldn't reach it with her fingers anymore. She sat on the toilet and started pushing it out, at first it was kinda working, but then the pressure made the can open, it flooded her rectum with fizzy drink and the now empty can easily slid out leaving her hole gaping and dripping. Normally she would have injured herself, but instead not only was she perfectly fine, the stimulation of having the can inside for hours and then the feeling of filling her ass had brought her almost to the climax. Without thinking she stroked her clit and this was enough to bring her over the edge: she collapsed squirting down the toilet.