Da-do what ya na-need, Doc,” Elizabeth stammered as her spread thighs stared to involuntarily shake.“Look, folks,” Dr. Tatum said as he held the thermometer against Lizzie’s vagina. “Her vaginal walls are soaked and contracting in waves, now. Those waves start at her vaginal opening here and work towards her cervix. Can anyone tell me why they contract in this direction?”“To help keep or force a guy’s semen deeper into her vagina and cervical opening,” Shannon confidently called out from beside me.“Very good. The contractions are used to flush or move semen deeper. If a lady is fertile, her cervical pump sucks fluids into her uterus, just like Elizabeth’s would be doing if she had unprotected intercourse over the next few days. Now, during a non-fertile period, a lady’s vaginal fluids would be...”“They’d be thicker and more acidic, and act as a ‘plug’ at her cervical opening,” Tempe called out with a smile.“Exactly, Tempe,” Dr. Tatum replied. He then asked, “Did you folks do a lesson. "Get on your hands and knees."I did as I was told. He pushed my legs apart farther and stood up behind me, his knees bent so his cock could enter me. He positioned his cock at my hole but then changed his mind. I looked over my shoulder to see what he was doing and saw his cock in hand, poised and ready at my ass."Rick no!"Either he didn't hear me or he didn't care; perhaps he knew I truly did want it. He dove two fingers into my pussy and lubricated my asshole with my own juices. HE pushed the head into my ass, kept it there for a second and then with one swift thrust his entire cock was in my ass. I cried out in pain, but as he bent over me and kissed my neck the warmth of his breath soothed me and the pain slowly turned into a feeling of pleasure, something new and exciting.He started grinding into my ass, humping forcefully. He took one of my legs spreading me open wider and stuck two fingers back into my pussy. I looked back and saw both my holes being stuffed by him, by the boy.
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