Put a second finger in that ass, of course!

You don't need (and probably couldn't get) any better sign to I know I like what you're doing. You just slipped your finger in my ass and I started masturbating. Yeah... I'm kind of hot right now. You move right on to the second finger.

Still frigging my butt with your index finger, you get a little more resistance as you try to introduce your middle finger to the party. But since my ass is already wet from your spit, your middle finger goes in, too.

Not expecting the second finger so soon, I jerk my bottom, interrupting my rhythm masturbating my clit. I let out a little grunt and start rubbing myself even more intensely as you start sliding two fingers in and out of my wet little butthole...