I'd just like to add, although I agree with this point...
There is still corruption that can happen after sex in a NTR/S story. I agree more significance should be put on that moment but the depths Lucy can fall too are lower.
She may fall lower. BUT you understand that after such indifference to the fact that your girlfriend spent her first night with another guy, it doesn't matter anymore, because he doesn't care about her. Just like Lucy, who didn't take a single photo to “report” to the man. Why didn't she? Because she didn't think about him, she didn't care, and all the words about love were nothing more than empty promises. Why didn't the Hero demand more from Lucy? For the same reason, he didn't care anymore. He was busy with useless chatter with Arnold, so he didn't care what Lucy was doing... And in this game, for some reason, the author forgets about the important moments and fills the whole time with chatter that means nothing after such moments. 150 selfies with clothes in places unrelated to the plot, in constantly changing clothes, as if she carries her entire wardrobe with her and absolutely must change clothes every minute. BUT when it comes to the really important moments, that's it. It's good if there are a couple of photos, and even then, not from Lucy, but on her lover's page. In other words, she shows that she doesn't care about the hero, and if the hero doesn't demand it either, then Lucy doesn't care about him either.
If I were the author, I would simply redo the game, focusing on the moments rather than the chatter.
After all, games like this are subtle psychology, where actions mean more than useless phrases like “I love you, you're the best, I'm so lucky to have you...” After such actions, the player stops believing these words, because the actions show the opposite...