This author is taking this far too seriously. I get that she wants to make this into a sex-ed manga, but there were so many missed opportunities where she could've hit both aspects. She did try to insert fun and comedy here and there, but... they just flat lined.
Take Futari Ecchi for example. If we take out the sex scenes, it's still hilarious AF and (somewhat) educational and relatable.
And not just the comedy, the characters here are... meh.
Maybe in future chapters they'll develop, but as of now it's pretty bland.