Stretch

Onyxatine

"A little pinch..." The nurse slid the short needle inside her arm, administering the drug into Alex's body. "There," she said. "All done. It should take about half an hour for its effects to manifest completely."

Alex rubbed her harm lightly where the needle had been. "Thank you."

"Are you excited?"

"Most certainly."

Onyxatine used to be an experimental drug, but it had just reached the milestone of general approval by the board. It could be taken in many forms: tablet, cream, suppository. But most adventurous users opted for the subcutaneous administration because that was most effective. It's purpose was sexual in nature, used primarily but not exclusively with those interested in the alien species the colonizers of Mars brought back to Earth.

This species, the Quasi, were particularly sexual, very open and shameless about their human-like sexual practices. With their arrival they gifted humans with the ability to honestly speak of sex and fantasy and desire. With them, they allowed the human race to experiment. They brought extreme methods of intercourse with few tools; their bodies were the tools. It was as if the Quasi evolved with the soul purpose of sexual pleasure in mind. They never stopped copulating, feeding off of each others' climaxes. 

Their arrival to Earth changed human life forever. Their blood, thick and yellow, contained the core ingredient of Onyxatine, which brought sexual arousal and extreme flexibility. When one was given this drug - with consent, of course, or else the drug could not work with the necessary chemicals of the brain - their body would be able to contort and stretch in ways unknown to the naive humankind, allowing for sexual experiences also unknown to the naive humankind.