American joke vol.8

A boy is home with his babysitter on a stormy night when the boy says "Usually on a stormy night mommy lets me cuddle with her". The babysitter responds with "OK". They are cuddling when the boy says "Usually mommy lets me take a bath". The babysitter says "ok". The boy is in the tub when he says "Usually mommy gets in with me". The babysitter says "Really? ok". They are in the tub when the boy says "Usually my mommy lets me touch her bellybutton" The babysitter says "Really? ummmmm ok". Then the babysitter says "Hey that wasn't my bellybutton!" The boy says "That wasn't my finger either."