What a good introduction to the girlfriend's parents. Although the stepmother is not her own mother. Still, she also decided to do her part in raising her stepson. The method she chose, it is true, is not the most popular - I have sex education. But I think it's a pretty brave decision. Considering that she is not his own mother, it cannot be considered incest; on the other hand, for this lady's husband, it cannot be called treason. Since it is his own son. Everybody wins!
In general, I understand the man - women are so good to bring the brains out, that I sometimes want to have a friend so hard to fuck! The most interesting thing is that his girlfriend liked it and she suggested that sometimes for a change in the relationship to apply such a role-playing game!