You hold off

Through great effort you manage not to knock up your moaning classmate. However, you shake a bit as you are closer to the edge than you thought possible.

"That was amazing," Ms. Kana exclaims. "Now everyone here is familiar with the female anatomy, let's move on to the male anatomy."

You slowly remove your cock from the girl, she turns red as everyone watches.

Ms. Kana points to the girl, "You may go clean up. You did very well today." the girl puts her clothes back on. She returns to her seat.

"Now I am a teacher so it's fine if I get pregnant. John and I will show you what it looks like when you ejaculate inside a women." she says, turning to you.
She pulls down her pants along with her panties, showing off her waxed pussy.

"John's already hard and ready to perform." she says. "Go ahead, put it in me," she tells you.

You put the head of your dick against her cunt and push forward. You can feel yourself sinking into her folds as you enter the warm confines of her vaginal cavity. She is just as tight if not more so than the other girl. The feeling is incredible. Your cock is surrounded by hot moist walls and her pussy is wetter than any pussy you've ever been inside.

"Oh fuck, that feels great," she moans.

You slam your cock into her, hearing the wet slapping sound of skin on skin.

"Now I need to cum," she says, "Start thrusting in and out."

You do exactly that, slamming your cock deep inside her. With each thrust, you feel her pussy muscles gripping your cock tightly. She is breathing harder and deeper now. Her eyes are closed as she pulsates her vaginal walls.

You reach up and put your hands on her chest. You pull apart her white button up shirt to expose her bouncing breasts, her nipples are covered by white pasties.

You pull of the pasties and take one tit into your mouth. You use one hand to rub her clit and the other to squeeze her free boob. After a few more moments of stimulation you free your mouth from her nipple, saliva drips down her boob.

Your cock is throbbing and you feel your limit.

"I'm going to cum!" you shout.

"Cum inside me," she instructs.

You quickly grab her tit once more with your mouth and bite her nipple causing her cunt to tighten. You thrust your cock as deep as you can and your balls explode, filling her pussy with your seed. She cries out as she cums too, pushing her quivering pussy against your cock.

You pull out causing semen to drip from between her folds, she lowers her hand to catch it.

Still breathing heavily Ms. Kana turns towards the class and spreads her legs. Everyone stares into her glistening pussy.

"And that's what it looks like. Now, because I'm ovulating, what will likely occur?" she asks the class.

"You will get pregnant," someone answers.

"Yes, that is correct," she says. "The sperm will make their way through the cervix and fallopian tube and fertilize the egg."

After giving a detailed description of sex and pregnancy, and letting a curious student taste the semen still inside of Kana, the bell rings and class ends.