I don't remember the name of this novel. What is it called? (Tentacle)

A long time ago, I read a novel about the female protagonist who fell into a strange world full of monsters. She had to keep having sex with the monsters and survived by luck. The male protagonist was the ruler of that world. Then, it seemed that once they became pregnant, they would be brought to a place to lay eggs. The female protagonist almost couldn't make it through. The female protagonist met a woman, but the woman tricked her into a monster's nest and was violated by the monster. However, she survived because of the male protagonist's "charity", but the woman didn't. There was a scene in the movie where they went to a beautiful canyon and there were many butterfly monsters. The female protagonist chose a plain butterfly that didn't look good. Later, a very beautiful seven-colored butterfly wanted the female protagonist. The female protagonist insisted on choosing the plain butterfly. Then, the butterfly followed the female protagonist and almost died. Later, it was taken by the female protagonist. The male protagonist wanted to have sex with the female protagonist, but the female protagonist couldn't bear it. There was also a fox raised by the male protagonist who took advantage of it What's the name of this article?