“Bench Tails” is a meme that refers to a feature in the first panel of a comic where Tails, from the Sonic series, is seen sitting on a bench, smiling, with his legs spread apart and his arms on the backrest. The image has been used as a troll and dark joke to remind people of the extremely disturbing nature of the rest of comic, for those who have read it or know of its contents, similar to the meme of references to the cheese grater image.
The comic in question contains a combination of extreme kinks which include cub, age difference, diapers, scatplay, vomit, incest, and farts, all of which combined with the creepy gentleness of the narrative is most likely to heavily disturb the viewer.