They were like plants growing from the same root, carefully cared for and raised by their mother. She did not allow any outside intruders to set foot in this garden, so they were tightly bound together from a very young age, using another form of strangulation into each other's flesh and blood, so they gradually grew into a shape that was uncomfortable but suitable for each other.
Their relationship was like a dirty bunny hidden under a suit, known only to the two of them.
Purpose: Self-salvation of the native family