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A fertile strain of Raptus has successfully been produced. It will repeatedly hump a mate until orgasm where it will shoot its fertile semen inside. This can impregnate the egg cells of a human female and appears to have such high sperm density it repeatedly causes twins or higher counts of off spring. Which will gestate inside the womb with the Raptus penis acting as a plug to prevent premature birth.
It's evident it causes the human body to act pregnant as the human will develop lactating breasts.
Furthermore it may cause quicker pregnancy as it requires much more human egg cells to replicate an insects egg count.
Lastly it will not stop raping a victim until death as its refactory period from orgasm is near zero (granted the humans not gestation offspring).