Oh god I love fucking through magic portals... sitting in a lecture hall, only half-listening to the professor go over the lesson plan for a day, when suddenly you feel something enter your pussy. In shock, you let out a breathless gasp, which gives you an odd look from somebody in the nearby row. The sensation fills your hole completely, and is rather warm.
There's no way you can check for anything, not in such a public setting. Before you can stand to excuse yourself, however, whatever is inside you starts to move. It pumps itself in and out of you, though when you look down, there's seemingly nothing. The pumps are enough to keep you from moving, trapped in your seat as whatever is inside you keeps moving at a steady pace. You try not to moan as your head feels fuzzy, and you have to keep yourself from playing with your erect nipples through your shirt. You're lucky that it's such a crowded room because of how much you blend in, but so many eyes means so much potential for anyone to figure out what's happening.
The sensation picks up, and now the warm feeling filling you is thrusting quicker, harder in and out of you. You're wet, though thankfully it's not loud enough to hear over the professor's lesson. You've given up on trying to parse any of their words, of course, you're too horny for that. You close your legs tight, trying to stimulate your clit in any way while you're being fucked, but your efforts are soon unnecessary because you start to feel two fingers prodding at your tightly closed folds
The fingers spread them apart despite your shut legs, and start to play with your clit, all the while you're still getting fucked. You tilt your head back and let out a quiet sound, convincing yourself that a little noise every now and then is fine. No one would pay attention. You close your eyes and sink down into your chair. You spread your legs out, not caring if your knees bump into your peers on either side of you--you cannot be bothered with thinking about breaking any norms while what you're pretty certain is a hard cock is fucking you senseless in the middle of your lecture, while a hand plays with your now throbbing clit
After a while of these frantic movements, there's a few more thrusts, followed by the sensation of being absolutely filled by liquid you know is someone else's cum emptying out into your tight, drenched pussy. The warmth combined with your wombs getting flooded is more than enough to make you cum, and you grasp at the arms of your seat and try your best to hpld back your cries as you nearly wet yourself from your orgasm. You're fairly certain there's going to be a wet spot when you finally get up. You slump down further into your chair, panting. The cock inside of you pulls out along with the hand, disappearing but leaving its liquid. You're positively filled, and some is even starting to escape to your panties. You're not even sure a human being can cum so much.
Miraculously, no one noticed, or at least if anyone did they didn't say anything. At the end of the lecture you get up and start to head out, but for whatever reason a woman standing by the exit catches your eye. Her figure is rather curvy, her features almost angelic. She seems almost motherly with how she carries herself and dresses--aside from her tight top, which her rsther large breasts seem to want to burst out of, and her expression is a fond one. She's staring at you with a satisfied smile on her face, and when you finally look back, she shoots a wink before stepping out. You have a feeling this won't be a one-time thing.