ehm, no. Boobjob, feetjob, blowjob ... it's all there ... in ch2 :closedeyesmile:
Oh, I'm really into violence and rape ... so DMD should be a disappointment to me ... but isn't because of the plot.
And the incest thing ...
Ok, I'm an only child, so no idea if I could be attracted to a sibling, but except some cousins I was never attracted to a family member, so you're very probably right: most humans wouldn't be attracted to a family member - as long as they know they are related in a close degree.
But incest is a taboo. Some hundred years ago there were a taboo to be in relationship or marry a person who is in a social group below your own. Or is from a family which your family is feuding. So Shakespeare and others of his profession wrote plays in which couples come together which break with that social rules. It woke disgust but more important it woke compassion for the tragic lovers in audience, to fulfill it with excitement and affection.
Incest was a normal thing or no hard taboo at least.
Today the old taboos are not existing anymore (or much less strict), but incest is a very strict taboo - even forbidden by law in many/most places. Breaking with that taboo, showing a couple falling in love which is forbidden ... here we are (most of us): full of compassion and affection and excitement