No, you couldn't disobey your professor

You put away your phone, then looked around nervously, suddenly worried that the professor might come out and catch you with it.

"So what do you think?" said Britney, who you now realized was turned towards you.

"Um, I'm sorry," you stammered. "What was the question?"

"I said, we need four people for this group project, and since there are so few guys in the class, the professor said each group needs one boy. Do you want to join our group?"

"You'd definitely be better than one of those jocks who only took the class to meet girls," said Ginny. The green haired girl had a low, gravelly voice, which was super sexy. "We know you'll be much more respectful."

"Yeah, sure. I'll... I'll join." Your heart was racing at the idea of spending time with these hot girls.

"Great!" said Britney, standing up. "Since Ginny and I are roommates, how about we all meet at our dorm room in an hour?"

The other girls got up, too, and Paula said, "Can we make it two hours? I have to go clothes shopping."

Ginny casually adjusted the scraps of her shirt that had torn around her massive breasts. "Yeah, I think I should do the same."

"Okay," said Britney as she handed you a piece of paper with her address on it, "it's agreed. Two hours! Everybody make sure you've read the chapter and come up with a few project ideas. See you soon, John!"

You waved, but stayed seated as they left, of course. There was no need in taking a chance on them seeing your raging boner. As soon as they were gone you rushed home and masturbated like crazy. You barely had to think about Britney pushing her big breasts in your face before you came.

The relief felt incredible. You'd never been that horny before. Now you could calm down and read the chapter to prepare for the study session.

Five minutes later, an image of Ginny in frilly green undies popped into your head. You imagined them perfectly matching her super long, green hair. The thought of her moving towards you and whispering into your ear with her low, sexy voice drove your crazy.

You pulled out your cock and jerked off some more. Thinking about Ginny was intense, she absolutely had to be wild in bed. The thought of her licking and dragging her big tits across every part of your body made you jerk hard until you exploded.

Back to studying.

Five minutes later, you started thinking about Paula riding on top of you, her pigtails bouncing more than her huge chest.

The increased libido that the professor gave you was really screwing you over. You couldn't stop thinking about the girls and what might happen during the study session. Obviously none of this would happen, but the tiny, tiny possibility that it might happen drove you insane. You jerked off for the entire two hours, thinking about each girl and various combinations of them.

By the time you knocked on Britney's door, you were fifteen minutes late, you hadn't read a single page of the chapter, and your cock was sore.