While no single definitive "My Cousin Sister" web series dominates the charts, several highly-rated or trending shows on IMDb fit the description:
In late 2020, the Indian government’s Ministry of Electronics and Information Technology (MeitY) ordered ISPs to block access to the video on grounds of obscenity and promoting unnatural relationships. Once something is banned, people instinctively search for official records—like IMDb—to understand what they missed. my cousin sister web series imdb