D's final corruption petal?
I hope it very much but I wouldn‘t call it that way. As I described it before,the pov of this story is from F‘s side and maybe for most of us here. The way this relationship evolves (the way I wished from the start) the F-D bind is loosening in comparation to an gradually stronger sexual bond. And that means that being his D opens special erotic pleasures because your D is not usually your sex partner. In this case F (player) gets step by step every sexual wish he desires from D. I don‘t think that pissing should be that much of an outliner in these circumstances. Yes, the idea that your beautiful daughter is drinking your piss is shocking and appalling but not in the world D is eager to please, not her F, but her master.