[Anime Crossover] Whose Twilight, Whose Fleeting Light?

This is a story about a girl with questionable values raising a little boy. This is a story about a dark heroine with questionable values who runs off with a pure-hearted hero in the early stages, who later becomes a chuunibyou. This is a story about a scheming, possessive older sister with questionable values who pounces on her younger brother, with the goal of making sure their eldest brother never gets comfortable. Along the way, they travel through many worlds and encounter many formidable characters, becoming darker and darker... Oh, right, the male lead's surname is Uchiha. Everyone calls him Second Young Master. =v= Lolis, take note: to protect your values, be sure to click the X in the upper right corner and run away. The heroine is dark and twisted, cold-blooded, willful, and mildly schizophrenic. The story contains both major and minor landmines, including incestuous love and stuff... The characters may go off the rails. The story is slow-paced and updates slowly, but it won't be abandoned, though it might as well be. If you're mentally prepared and still choose to come in, then welcome to throw bricks and toss flowers... The heroine's views do not represent the author's views. Oh yeah!