No, but he has his reasons...

You moaned whorishly as you bounced up and down on Mr. Chambers' cock, its thickness filling your wet twat nicely. As you bounced up and down, you could feel his cock getting even thicker, knowing from your own experiences what that meant, you tried to get off before he filled you, keeping you as a girl permanently.

"M-Mr C-Chambers... remember to p-pull out!"

"Oh I think not Stacy... Or should I say John!"

"Y-You know... How?"

"A friend of mine called me right before you got here, told me that you would stay a girl if you got pregnant. You always slacked off in my class as a boy so maybe you'll pay more attention as a GIRL!"

Mr. Chambers kept a tight grip on you as he bounced you up and down on his throbbing cock, your body reacted against your will, your pussy tightening as your own climax drew near. Mr. Chambers whispered in your ear. "Besides, all the other girls in my classes get away with just giving me blow-jobs. It's about time that I got to FUCK one of you sluts"

As he said the word 'FUCK', he emphasized his point by giving you a particularly deep thrust, which sent a shockwave to your brain, triggering your climax. You wailed as you came HARD on his meaty invader. Mr. Chambers groaned as he released his potent baby batter into your womb, trapping you forever as a girl.