On my back in the missionary position, he slides his cock into my asshole. Not just the tip, but balls deep. He fucks me like this and I can see he really enjoys the feeling. I love it too, and I feel like I am a very lucky girl to have such a good teacher. I want to show off the 'automatic' technique I've been practicing. But first, I suck his cock to make sure it is very hard. Then, I sit on him in the cowgirl position and spin around for reverse cowgirl. I love to ride like this. He can just relax and enjoy the feeling and let me do the work. It's really fun to be the boss! I can feel his cock getting bigger and bigger inside my asshole and I know it's almost time for my treat. On my knees, he cums into my open mouth, and not a single drop is lost. Thank you, teacher!