I-I'm becoming a rat girl...!

The bite from that rat creature earlier was now nearly gone, just a small red mark on your arm, not even a puncture anymore...while it's a relief for wounds to heal, it was disconcerting to watch it happen over the course of mere hours. But hours or days didn't matter as much as finding your way out of this forsaken dungeon, and you hoped you'd find the exit before your supplies ran out...

With a shock, you feel something cold touch your backside...no, not quite your backside, somehow lower than that, and in a way you've never felt before. You whirl around and the alien sensation spins with you, but only an empty dark corridor lies behind you. You reach backward and find a thick, fleshy protrusion at the base of your spine. You don't want to admit it to yourself, but you know exactly what it is, to your horror...you pull it forward into view and confront your newly-grown rat tail, already long enough to drag on the cold, stone floor behind you.

As you stare at your new appendage in trepidation, your fingernails push out into claws and your hands become knobby and paw-like, befitting of a rat. Crawling, squirming sensations envelop your body uncomfortably, and you strip off your gear and clothes to get a better view of your changes. Grey fur is spreading everywhere...but more concerning is your chest, blossoming and ballooning forward...you're not merely becoming a rat creature, but a female one.

Your feet reshape and lengthen, causing you to lose your balance and tumble to the floor. As you stare down at your rodent body, you are forced to acknowledge your lack of certain equipment and the extra teats forming on your stomach. Somewhere far away down the hall, you hear the chittering of others like you, slowly approaching...