A sting in the tail (or neck in this case)

As Rocketgirl lay there on her professors desk, exhausted and full of his seed, she didn't notice someone had gotten to where her head was until she felt a sting in her neck, she didn't even get to turn her head before she was ****. Professor Lex grinned as he went back to her legs and lifted them and her lower torso area up, ensuring that his seed would catch.

To ensure she did get pregnant by him, Professor Lex took her to a secret area under his office. He smiled as he entered his hypno chamber. It consisted of a chair with no base and a big TV. Connected to the chair were a series of restraints, head, arms and legs as well as a mechanical dildo with a surprise. This particular dildo had a hole in the top and was connected to a vat of Professor Lex's cum.

He quickly got Rocketgirl in position, positioning the dildo at the entrance to her moist pussy before restraining her, the head restraint keeping her looking forwards. Once he was happy she was ready, he left the room and started the TV and the dildo. Rocketgirl gasped as she felt her pussy being penetrated again just as the TV started playing subliminal messages telling Rocketgirl that she belonged to Professor Lex now and that she would become the mother to his children.

Try as she might Rocketgirl couldn't look away and once every three minutes, the word 'CUM' would flash up on screen, triggering Rocketgirl's orgasm which in turn pulled another load of cum from the dildo, keeping the hypnotized heroines womb full of potent seed. Professor Lex only stopped the TV and dildo when he saw Rocketgirl's eyes glaze over and drool start falling from her mouth.