“
Aunt” looks too cute and young in “reality” pictures (there is no that close to uncanny valley effect as it is in game).
As for Paul,
yes, there is no need to cut him out entirely, only remove some dialogues and pictures related to blackmail; for the rest of the game Lisa can completely treat him like an annoying domestic pet. And even transitions in routes don't need to be changed, they will be in the same place (1st for more exhibitionism, 2nd for dominant). Then either Lisa herself becomes quite receptive and simply continues to
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him without shrinking and hiding, but still every time upsets him, or after a “slightly modified scene in cinema” (which will already be initiated by herself) she switches to “dominant path” (for example, he “will persuade”/“beg” her to give it a go, “is ready for anything”; or she begins to act more like a "hands-on" teacher, maybe even find him girlfriend after that, for example the girl she tutored in math), otherwise he will remain in the same completely passive state.
I think that more romantic path, that person
above is talking about, is already largely closed by “wunderkind” and there is no point in implementing it through Paul.
As for momentary actions, it's not necessary to implement all this “right now”, just cut some of it and leave transition points, the rest will happen later, if there would be time (it doesn't interfere with rest of routes in this form).
ps. House actually will be too empty and boring without Paul, as it was at the game's start.