She picked Vince

"What about you Vince? I think you would make a fine piece of mea- I mean a fine volunteer." Miss Winter said as Vince gulped as he slowly stood up. He had no idea why all of this was happening to him at the same day as he slowly walked to the front of the classroom. He walked before the teacher the futa smirking down at him as she slowly reached down and gripped his fat ass cheeks making him gasp as she quickly before pulling down his shorts revealing his massive fat mocha cheeks as well as his tiny state issued chastity cage. Vince flushed as he felt the teachers' fingers begin to poke against his ass.
"Now I will stimulate the boi's womb and show you how a healthy young male reacts to being penetrated." Miss Winter said as suddenly she pressed two of her fingers into his ass making him gasp! Vince felt a shockwave of pleasure go down his spine as he felt her twin fingers push into his tight virgin ass. HIs ass began to grip down hard onto her fingers as she quickly made her way upward to find his prostate making him make an embarrassing squealing sound as he threw his head backward as she found his P-spot.
"As you can see I have found the males prostate. Now with just a bit of applied pressure you can **** them to orgasm which will also help with opening up their womb for impregnation. As you can see however this male has been locked in chastity. This chastity cage is special and will not allow him to orgasm no matter how much pleasure is applied to him." Miss Winter said as she began to aggressively press her fingers against Vince's prostate. Making him whimper and cry tears of frustration as his dick surged painfully in its tight metal cage. He tried to squirm and make himself cum but the cage fully prevented any such pleasure as she continued to finger him.
"Now I will insert myself deeper into him to stimulate the womb directly."
"W-wait! You are going deeper?"
"Yes I am. Now be still." Miss Winter snapped making Vince freeze as she leaned down and whispered into his ear.
"Keep still you little brown bitch or I'm going to breed you without any lube in front of the class." She hissed as she shoved half of her hand inside of his ass making him yelp! Tears ran down his face as he saw several futas openly stroking their cocks and many bois doing the same with their miniscule dicks as well as trying to look as small and inconspicuous as possible. As she drove her hand into his ass he felt her fingers reach a deeper part of him as something split inside of him making him howl in pleasure and frustration as she spread open his womb and began to finger it directly.
"Now as you can see I have spread open and entered his womb. From now on his fertilization is almost guaranteed. And judging by the way he is clamping down onto me he is very fertile indeed. His ass is begging to be bred but we are not here to do that today. Or well... maybe the class would like to demonstrate how to breed proper?" She asked making Vince whimper as he shook his head begging for mercy as several futa hands shot up as Miss Winter smirked.
"Now let's see maybe we should let you sit back down or maybe we should see how hard you try to cum with a real cock inside of you~"