Your explanation perfectly match my understanding of their relationship. However, that is exactly why I've asked the question about her IRL prototype. Speaking directly, I have the doubts that such human does exist.
At the same time, I have too good self-control to be distracted by more trivial thoughts about VN's character. And "years of experience" to boot. Thus, I repeat myself and others here, that CH is the novel at first, visual at second, and adult at third place only. And it is second to none!
On completely unrelated note, some bug-report like things: