Turned out, without even noticing it, one of my fingers was brushing the side of her breast, giving her the right kind of chills.
These casual slips, or barely touches, can drive a partner wild.
This led to some interesting discussions about what can happen on your way to first base: This can include the butt.
When you're ignoring his or her main event space, there are other locations that become incredibly sexual. That place where the butt meats the thigh—it might a well be called Las Vegas because it's Sin City down there.
In other words, fingering, a hand job or oral sex is third base.