NGL, I actually see this as a more reasonable pace for a relationship to develop. Typically manga portray dating as either a never ending slog of denial with brief moments of deredere embarrassment or you get the average harem trash that hookup as soon as they can find a vertical surface to fuck on. Yes I know I'm slightly exaggerating, but not by much.
This by contrast is taking a more measured approach. The relationship has been built up over the course of a few chapters, and while true it might feel a little forced, just remember the author and or mangaka is as young and likely just as inexperienced as you are.
What's with the unnecessary personal attack when you don't even know me bruh? Unless you're referring to storywriting, then you'd be right, otherwise you're clowning or projecting – off the mark.
Idk about "reasonable pace." They got a development here faster than romance dedicated mangas brahh and they still wanna pull the classic clichés. I'd still read these shet anyways, like who wouldnt, for the first few chaps. But this is literally typical bait plot in a lot of trash isekai/fantasy. Pacing isn't the only thing that matters, it's the development in that pacing. It gets annoying when you see development only for it to regress. Slow or fast, development should be moving forward, that's why it's called, "development." When she didn't initially react like the typical mangas, it felt refreshing and surprised me. Then that happened and now I'm like, "yeah nvm there we go i should have expected that"