Obedient schoolgirl takes huge facial with hands behind back

My professor is so stern with me and I just love the way he bosses me around. After I failed my latest math test, he told me to stay behind after class. Next he ordered me to kneel with my hands behind my back and took off his pants...and I think you can figure out the rest. I'm a good girl taking a big facial after sucking off my professor's cock, and I keep my hands behind my back the whole time just like he ordered.