I've thought about this before (others may have already commented about it) but I think it's accurate to note that, unlike most other AVNs, BaDIK is virtually only dialog. There are very few lines of narration (some times the mc is thinking to himself, but it's a real time dialog with himself, not narration as such).
Other than the beginning where he introduces us to his dad and talks about family, the rest of the game, as far as I can recall, is dialog between characters or his thoughts at the time. There's no descriptions during the sex scenes, just visuals and dialogue. Most other AVNs have the mc narrating the whole game and have explicit descriptions of what's going on during sex scenes.
There's only two other exceptions I can think of, one was when Bella was crying when they were making out in the library and he commented he should have got help and then other was the monologue about doors at the end of ep3.
I think I like the dialogue only approach better, it's more nuanced rather than spelling things out. I think it's quite brilliant actually.