I know you're being petty and a smartass but yes, it probably won't happen.
My guess is the following: SPOILERs for beginners
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Aunt is aunt and only during past, doesn't exactly have the same impact but hey, it's something.
I'm not going to engage with your theory because it's "just a feeling", but unlike your original post the incest patch had already been used (in a scene) and the whole relationship between mom and mc only works with the patch. Otherwise there is no need for a landlady to be stressing so much over an unrelated dick.