>>25221826She does get massages though, so imagining such a scenario isn't so out of the realm of possibility. And as you say, imagining her reacting as she does in those two doujin isn't as far out there for her character.
>imagine being a lecherous fat ojisan that gets to knead shuba's fit body but soft ass all day all the while upping the lewdacity so incrementally she doesn't notice till it's too late