It was a series that had been going on with a while, I think the girl's name was Cherri? It wasn't an official "set" but it was a long going series of single images being uploaded (sometimes they'd be a few panels in the one image, but each image was it's own one shot.) She had gotten pregnant by her dad multiple times, had sons and would sometimes have sex with them too. Her mom was never shown, it frequently had a lot of art of her being pregnant, there was at least one that had her drinking her dad's pee while very happy, it was a great series with a lot of kinks. Sadly I can't seem to find it anymore though. I even looked through my bookmarks and couldn't see it, I tried looking it up based on the gas and couldn't find a thing. Was it taken down or removed?
Topic: What happened to the one series of the daughter who had a bunch of kids with her dad?
Posted under Art Talk
You can add status:any in your searches to also include deleted images in your searches.
It seems that it was taken down, because this seems to be what you are looking for.
https://e621.net/posts/3862274
The art is still available on the artist's inkbunny account.
And for future reference, there is dedicated thread for looking up lost artists/art.
https://e621.net/forum_topics/55834
For reference