So according to you, Sage wouldn't fucked MC in front of everybody. She would have backed out, despite saying things to MC like "you pull your dick out or I'll do it." Then, why DPC decided to introduce Jacob in the scene? It would be easier just a scene of sudden regret like the one of Josy in the first date. "Actually, we can't do this, is too risky". Or just a scene of a kissing and groping session on the dance floor. It would reached Chad it would be more than enough to make him react, if that was Sage's target.
DPC writing in general is bad (even if in ninety percent of the games on this forum it is even worse. In the land of the blind the one-eyed man is king), and it's getting worse. In the latest update, MC dialogues are becoming more and more boring. There are hardly any funny or witty moments when he talks to Sage, Bella, Jill or Zoey, for example; and more and more things happen without MC intervention. The girls' problems fix themselves, like Jill offering Maya her lawyer. MC is increasingly a bystander in the plots, and this is a game, not a movie or a novel. MC is the Main Character and the Player. Things must happen because of him or at least he must have an important intervention. Otherwise, what is he for? And yes, that makes MC a Mary Sue, but then again, it's a game. Aren't Mary Sues Commander Shepard from Mass Effect, Geralt of Rivia, and so many other video game characters, like super heroes, who spend their time saving the day? It's no fun playing as a character, seeing how he's just a supporting character in the plot.