This is a great idea but would be very niche especially for sitcoms. I once asked a couple of users here and they didnt really watch sitcoms (IASIP, Arrested Development, Peep
Show, South Park, Archer, American dad etc. are awesome shows that everyone should try!)
Parody of cartoons are much popular as many have seen them growing up along with anime parodies.
There's also parody of big shows or movies like Whore of Thrones for (game of thrones) or Lust Academy has pretty much nailed (pun intended) the model for Hermione, there's couple star wars floating around like SWE1, Tale from the unending void...etc.
All in all, there's certainly some very good humorous AVNs on this site (I'll add them if you want) but I'm not sure if there's sitcoms one coming any time soon. We can hope
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