Snake-Son of Corruption

Finding the fallen heroes and their twin children first, Orochimaru takes the boy for his experiments. After thirteen years, the boy became greater than Orochimaru had hoped, and even more corrupt than him. Now the world has to deal with the results, starting with Konoha. Experimenting-Scientist Naruto. Female Menma as Twin. Maybe harem, but plenty of fanservice if not. No Yaoi.