After the student failed to return the experimental test artifact on time, a team was dispatched from the lab to retrive the said object. It turned out that the student had been using it on various other girls, and the first girl had since become his accomplice. According to the results, the test object would no only enhance the girl's physics, but also completely wipe out their personalities and turn them into sex-craving machines. Once the oject had been recovered, the lab took effort in reversing all the girl effected by it, while the student had to pay a hefty sum to cover for all the damages. However, something happen that was far beyound the scientists expectations. When the first girl to be effected by the artifact interacted intimately with a recently effected girl, the artifact began merging the two together as it saw them as one individual with the same personality and therefore did not need two seperate bodies. After discovering the fused girl, she was sent to the lab for further testing as reversing the merging process was beyond the lab's capability at the moment.
And, due to the dangerous nature of its effects, the artifact was destroyed shortly afterwards.