I like the small attention to detail on pg 5. The night sky is filled with stars where Sakura is at suggesting he's in a more rural area while there's hardly any stars where Rika is at because she's closer to the city and it's lights.
The guy is looking at this new world through his old world view. He didn't grow up a weak minority. Of course he thinks it's a good time when most of us would. The crux of your argument is complaining about realism in a fantasy manga with magic and dinosaurs. You think you're smart for this but...
The story is about a couple exploring their sexuality. The build-up between sex scenes is important because we're seeing how they're changing from an innocent couple to a debauched one. Yuki is learning how to be a better dom and achieving her sexual fantasy while the boy is slowly being...