I think some people clearly played a different game from me because what they call "teasing" and "regret" was, for me, moments that were building the relationship. She didn't so much express regret as she did trepidation, which is understandable given that she was doing these things with her son, and he had expressed a desire for her that she was still coming to terms with. Their relationship was progressing more gradually because they were much closer to each other than Eva and Lily were to the MC, so there was naturally more of a barrier there.
But then, and especially after all they've been through and been doing lately, the thought that she almost lost her son is what finally tips the scales and she gives in to her lust and her love. She doesn't hold back any longer knowing how close she came to losing him and how much he means to her, and this seems perfectly fine given how this relationship has been built up; it's not suddenly been rushed.
Anyway, the render quality's been steadily improving in this game to the point where Nora was looking very good in this update.
I feel I can sense that this game, when it's done, may get a revamp to improve the whole quality to be at whatever level the game will be at when it ends.