The Finger (Futanari Experiments #1)

When Brie receives a large, attachable "finger" that enhances sensation, the first thing she does is stick it on her clit. When it works as planned she proceeds to use it and abuse it, then shares the fun with her best friend and co-worker, Erica, who went to investigate why Brie missed an entire day of work.

This story contains explicit depictions of sex between two women with the help of an attachable, feeling "finger."