All of them

Perhaps they figure you seem to enjoy being treated like a cum receptacle, or perhaps they just value getting their bonus marks, but none of the girls opt out of Mr. Hector's offer.

His cock visibly erect in his pants, Mr. Hector manhandles you onto your back, pinning your shoulders down with more force than is necessary...you nearly tell him that he doesn't half to hold you down, since you're just about ready to do whatever you need to do finish and go have a long nap. You keep quiet though - talking to Mr. Hector doesn't seem like it'll do much good...

One by one, the girls of your class - gingerly - grab a full condom, stick the open end into your mouth, and make you drink down a load of your classmates' thick baby-batter. The first eight girls finish as quickly as they're able to, leaving you feeling stuffed and bloated from all the cum you've swallowed, but the final girl, Andrea has a big grin on her face as she steps up to the desk and starts talking.

"I never realized what a cutie you were. No offense, but you look way better in a skirt."

Your smiling classmate is tall, blonde and well-developed. Though she's stuck wearing the same uniform as everyone else, she manages to show a lot more skin than most girls. She isn't an Attendant, but you've heard rumors that's she "gets around" just as much as one. Not that you had the courage as a guy to test such a thing...

Taking a condom from the desk, Andrea upends it above her own mouth, taking in about half its contents before plunking down the half-emptied condom next to you and climbing up onto the desk until her knees are straddling your waist and her face is inches from yours. Her body brushes against yours in numerous places, and you're pretty sure you'd be as hard as a rock if your cock was so worn out right now.

Out of the corner of your eye, you see Mr. Hector watching attentively...he may not have given the okay for this, but he seems to interested in the show to stop it.

You're too flustered by the close contact to ask what exactly she's up to, and your mouth is quickly blocked anyway as Andrea leans forwards and plants her mouth on yours. Her lips feel amazing, and your aching member gradually struggles to back to life as you feel her body press down on yours. Her tongue forces its way into your mouth, and a moment later you experience the now-familiar taste of semen.

Pushing the load of cum from her mouth into yours, Andrea begins ravishing you with her tongue, kissing you so aggressively that you barely even register the cum dripping down your throat. Your head's spinning by the time she breaks the kiss, but after stopping only long enough to take the remainder of the condom's contents into her mouth, Andrea has her lips locked with yours again.

Your head swims with pleasure, and you realize you're humping Andrea's lower body as she kisses you. After your cock fruitlessly thrusts against her skirt a few times, she obligingly reaches down and tugs it out of the way. You eagerly shove your cock upwards again, moaning into Andrea's mouth as the soft fabric of her panties blocks you from entering her.

You can feel the warmth and wetness of her pussy on the head of your cock, but no matter how hard you thrust, you can't get in. It feels incredibly good anyway though, and ignoring the fact that a room of people are watching, you thrust your hips into Andrea with all you've got, feeling the tip slightly enter her every time you press into her underwear.