Teaching my stepson how to have sex

My husband and I decided that my stepson should be able to use my body to learn how to have sex, but when he went to put it in me, you know, to practice, he put it in the wrong hole! He just kept fucking it too, like he really didn't know any better! I didn't want him to get upset though so I let him get it in real good for awhile before I broke the news to him.....You're fucking the wrong hole!!