Now that would be interesting. One should be polite even if they're obsessive. In fact they should be more than a normal person. Pft... Thinking they do what is best for his or her subject.
If they're smart they will, plus a yandere is too shy to address the subject of her obsessive affection. She is a coward. After all first images can be everything.
Well, the thing with yandere is they put all their effort into things but it doesn't always turn out well.
So she probably wouldn't but you'd have to pretend it's great.