I liked that they showed their butts outdoors to have sex.
I recommend watching SDDE 522, it's a JAV.
Although it would be interesting to see the process of them losing their inhibitions and morality (it would be long, but it would be worth seeing)
how a conservative mother who only does it to have children goes to church every Sunday and in the end (last chapter) ends up being a slut who only wants to give blowjobs (she ends up wearing a slutty outfit)