while i personally love those thin, unrealistic hourglass proportion on my anime porn girl,
i do agree that the dick were too big for the girl.
it just weird that later when insertion happen, the dick will magically shrunk in order for it to not make the leg to expand weirdly since its definitely too big for vaginal insertion, or to minimalize the dick bulge to alter body and make it lose its hourglass proportion and became weird visually.
i think the author should instead start with hilichurl (with dick atleast 3/4 to 9/10 the size of her waist, if the author insist on large insertion genre) first before jumping to lavachurl lol