God knows what happened.

Maybe some mad researcher was messing around, or some hostile group of interest was testing out their new anomalous weaponry, but it would seem that half of the sapient anomalies contained at Site-19 had turned into females.

Not only were they frustrated by this sudden transformation, but it was really distracting for personnel.

Unsurprisingly, SCP-106 used the window of opportunity to escape containment. Now, she's wandering about the facility, searching for victims.

You were watching your surroundings and trying to traverse the maze that is the Light Containment Zone, you began to hear a strange sizzling noise. Behind you, 106 ascended from a puddle of black corrosive mucus, grinning at you sadistically.

It shouldn't be too hard to escape her- OH MY GOODNESS SHE CAN RUN NOW!