During an extra tuition biology class, teachers Mike and Cathy clash over whether men can also have multiple orgasms. She teaches the girls that only women can cum twice but Mike claims he can do it himself - so the girls jump on him and intend to find out! They strip him naked and start jerking his cock until he cums on himself. They then clean him up before starting work on his cock all over again. To their amazement he shoots a second load for them and they admit that maybe they were wrong!