Play The Game and Lose

With a lecherous grin Dr. Topple says "All throughout the day I let people go down on me. I let them go in and out all they want. What am I?"

You blush at the filthy riddle clearing your throat before giving your answer, "An elevator." You say confidently.

Your coworker's grin grows wider. "Wrong. I'm a slut."

"Wh-what!?" You exclaim, wide-eyed. "What's going to-" You gasp as Dr. Topple holds up her right hand which now sprouts an extra finger, one smaller and paler than her other fingers.

"Don't worry dear, I'll take good care of it." She giggles sucking the finger slowly and winking. You're slack-jawed as you feel your finger in her warm, wet, mouth. Holding up your own hand a sense of fascinated horror overtakes you as you take in the sight of your hand minus its middle finger. "I'll leave you to process things. Give me a call if you have any questions." Then she leaves you alone.