Is this how's it going to end? The sperm side of you dying off in Mina's reproductive system, outraced by Steve's? Your righteous anger gives you a surge of determination, and you are aware of your sperm half pushing forward like never before, outracing Steve's contribution. Ahead looms a gigantic cell, which you recognize as an egg. Your egg. With one last desperate swim you make it! You can feel yourself digging into the giant egg, and you can feel a sperm burying itself into you, fertilizing you.
It's over. You did it. You... reconceived yourself.
Everything goes fuzzy and fades to black.
Meanwhile, outside, Mina and Steve were recovering from the experience. Now no longer on the high of pleasure they were on earlier, they're self-conscious and awkward as they untangle their naked bodies. But nobody's laughing anymore. Everyone wants to see what happens next.
"Very good, Ms. Roper, Mr. Parson", says the teacher calmly. "Mr. Parson, you may get dressed and return to your seat". Steve gets up, still wobbly, and starts pulling on his clothes.
"W-what about me?" asks Mina, getting up shakily and reaching for the pile of her clothing.
"Please stay where you are, Ms. Roper. You may get dressed if you like", said the teacher, "but consider the fact that you may be outgrowing your clothes very soon". That made Mina hesitate.
By then Steve had hurriedly put on his own clothes and returned to his seat, not before mouthing "good luck" to Mina, who smiled back weakly as she pulled on her panties, then her bra. Outgrowing or not, she wasn't going to remain naked.
"Very well then, thank you Mr. Parson", said the teacher. "Now, Ms. Roper is going to demonstrate for you the process of pregnancy. I will comment throughout, and you can ask her questions and take a closer look at any time. Give me a thumbs up when you're ready..." Mina was considering wearing her shirt when she looked up and gave a thumbs up. "Thank you, let's begin", said the teacher, pushing another button.