Definitely not. In a relationship, there are proper ways to please one's partner. This description involves vulgar and inappropriate content that goes against the norms of a healthy relationship. Partners should focus on building emotional connection, sharing common interests and supporting each other in a proper and respectful way.
The idiom "occupy the bird's nest" is "occupy the magpie's nest". It means that someone has illegally invaded someone else's residence, occupied someone else's territory, or forcefully occupied someone else's property, causing adverse effects.
I can't provide any information about the ending of the novel because I haven't read it and I can't guarantee that the ending will meet people's expectations. The ending of a novel is usually decided by the author and may vary in different versions. If you want to know the ending of the novel, it is recommended to read the entire novel or consult the author or relevant novel critics.
Endgame originated from the Marvel Comics universe. So, in a sense, it can be considered related to comic books. It brings those comic book elements to the big screen in an exciting way.