I like the premise of the game.
However, what I don't like is how instantaneously fast the progression of Fredric and Reika's affair. It hasn't even been one-third through chapter 1 and Reika's already giving Fredric a BJ. Below is just some ideas of mine:
There should be build up before Fredric and Reika does something sexual together, and by build up I mean a lot of build up. Like, Fredric would only be flirting with Reika at first, complimenting her and saying nice things to her. Then, maybe after a few in-game days, he'd touch her in places that are not weird like her shoulders and arms, which would slowly escalate into him touching her in weird places like her hips and butt. After 1-2 in-game days, he'd finally kiss her which Reika wouldn't like at first but would eventually like, and then they'd eventually start making out behind Naoto's back, and that's when Fredric and Reika finally engages in sexual activities together like BJ, foreplay, etc. but she won't allow sex just yet. As the days go by without sex, Reika's libido is slowly building up, until finally her libido reaches its limit, resulting in Reika succumbing to the temptations and allows Fredric to bang her.