Emily and Natalie were sitting on the bed when they decided to start feeling one another's teeth with their fingers, which lead to the eventual feeling of the gums and the roofs of their mouths (which is a very sensual and orgasmic experience because of the sensitivity of the roof of a person's mouth.) Next, Emily started to make out with Natalie's finger.
"Emily! You're making out with my finger!"
"Oh! I am!"