>>53587034>mistakeAnon there was no mistake. Artists draw Lana's mom with massive tits because she is a mother and the trend for the past 15 years or so has been "thiccness" and "mommy milkers." That's really all there is to it. It doesn't matter how canonically flat a popular mother character is these days, she will primarily be drawn with fucking huge titties.
For proof of this just look at Lana's mom and Delia on Gelbooru. Compare the last several pages of art and notice how Delia tends to have far more modest breasts while Lana's mother almost exclusively has massive cowtits.