liked the start, just found it weird how the sister was so confrontational moments before and goes from there to having no problem sitting on MC's dick and showing her tits off to someone she is super ultra annoyed for being a complete pervert lately, even if you do apologize to her in the morning, but you get the same result if you don't. I understand that she loves her brother a lot and is worried about him, but I think she flipped too quickly, and the argument that she got saved don't really hold much water because MC had saved her from a much riskier situation before and she was still very annoyed about MC's behavior.
I understand the dev probably wanted to make the scene lewd, and I don't really care that much, it's a porn game after all, they all have porn logic, it was a good scene