Finish the biology lesson

You keep thrusting into the excited girl as you pull her hair, making her bend back as she grinds on your impaling cock. Her tight cunt convulses around your shaft, gripping and squeezing as she comes, making shrill animal noises of orgasmic bliss.

You're grunting as you fuck her, sounding like a feral beast as you rut on her sweet young body, savouring the sensations of her aroma and the sounds of her eager submission. You want nothing more than to flood her ready cunt with spunk, and for a moment your animal brain regrets that you've had a vasectomy, removing any chance of putting a baby in this fertile little bitch's belly.

"She's ready, ready to receive his seed," you gasp, continuing the biology lesson. "She raises her hips so it will flood her cervix, fill her womb."

"God....so ready! So fucking ready!" she howls, writhing frantically. "Breed me...Oh Fuck Breed Me! Put A Litter of Pups In Me! So Ready! Breed Me!"

She looks back at you, her hungry feral eyes glittering with need. It's all you need to trigger your pulsing cock. With a roar of conquest and triumph you drive deep into her fecund cunt, pulling her hair hard as you start to come, your cock spurting hot jets of cream into her helpless body as she moans ecstatically.