Yes, it’s true that the cartoon is not truly accurate to the bible verse in question. The authors embellished a bit. And, the fucking took place on two different nights, not the same night. Here’s a link to the original text.
As you read Gen 19:30-38, keep in mind that these are the same two daughters from Gen 19:8, just a few paragraphs earlier, whom Lot offered to sell into sexual slavery to the men from Gen 19:4 “the men of the city, even the men of Sodom, compassed the house round, both young and old, all the people from every quarter.”
Isn’t it nice to know the daughters, even after this attempt to sell them into sexual slavery to a whole city full of men, still loved their father and wanted to “preserve seed of [their] father.”