I don't see anyone complaining about LeNeRAKIStaCoPreProGiYoKisSoMuMoUn so I'm assuming the NTR premise was a smash hit.
It seems it was, lol. Love that name, btw. Aya sucks at shortening titles.
At this point of things, everybody and their uncle should have realized that this story has no political correction whatsoever: it's just a self-satisfaction fantasy, and the Japanese don't like pc stuff getting into their fantasies. That “purei” Aya forced Marika to do was about a lesbian girl who has a cute girlfriend but is kidnapped by a dastardly lady stalker who locks her in a basement then proceeds to rape her every day for the next few months... and the kidnapped girl loves it and totally falls for the villain: after two months in that basement, she's already saying mushy lines like "Compared to my prim and proper girlfriend, your evil kisses are SO much more unforgettable! ♡ " That's the sort of dominance/conquering/corruption fantasy Aya likes to picture in her mind while she shlicks... and it's okay, it's her damn beeswax, she's entitled to it and no real people were harmed in the process of reaching that orgasm!
In the same way, Aya and Marika are just an expression of Teren Mikami's own fantasies. Yeah, Marika is a "normal" chick who isn't into girls, and yeah, because of the bet she has to submit like it or not to Aya's sexual harrying, and yeah, after three months of this regime she will be so crazy about Aya she'll happily and completely surrender to her conqueror. That's just how the story goes. Saying things like "Marika is actually a lesbian and Aya's making her discover it" doesn't change anything to these basic facts; it's just an attempt to sanitize the plot to make it more acceptable for Western pc sensibilities. A really bad attempt, imho, because it seeks to add a correction varnish to something that originally is (and never pretended to be otherwise) shamelessly and barefacedly incorrect.