The models demonstrate the functional value of the physiological response to arousal

"What's difficult to appreciate here is the complementary nature of these physiological responses." Ms. Weller starts, resting a hand on my thigh as I sit, legs spread wide, on the edge of her desk. I almost shudder at the touch, too distracted with intrusive thoughts of Jason's cock (I said it again!) to pay too much attention to the lesson. "Who can characterize the reproductive benefit of these physiological responses?" She asks to the class.

Hands raise. She calls on the girl who was sitting behind me. "So his cock can slide right in!" She blurts, the class laughing in response.

Ms. Welker ignores the laughter, only nodding in reply, gesturing at Jason to come over. "That's right!" She says as he walks up with an awkward grin, as if he's just trying to figure out how to be helpful. "Jason, a practical demonstration if you don't mind?"

"Um, Ms. Welker?" He says, my eyes glued to his hard cock (oh my god I'm staring right at it!), my pussy practically drooling for it. "What, uh, what do you want me to do?"

"Go ahead and insert your engorged penis into her vaginal canal." Ms. Welker pushes him up between my open legs, his cock (!!!) stiffly positioned mere inches from my suddenly aching slit. "Class, come around to get a better view... You there, get a good video of this, we can use it next period."

"Um..." Jason looks awkwardly at me, and I bite my lip, too focused on him to notice the other students crowding around us.

"Alright, class, just like this." Ms. Welker says, grabbing Jason's cock (ohmygodohmygodohmygod) and guiding it into my waiting pussy.

"Oh God..." I gasp as he presses into me.