Mostly realistic and wholesome sex (though perhaps orgasming merely from a cute line of your girlfriend is over the top), that certainly makes my day. I hope that eventually Haru will be able to return the favor to Maho despite Maho's reluctance, because I think always having to be bottom is not fair if you truly want to please your partner as well.
Most importantly the author didn't cut corners with properly establishing the relationship outside the bedroom as well. The sex was the core, but it was surrounded by a shell of SoL, which I enjoy more. Tired as the hidden relationship trope may be, it was endearingly cute when Maho was fed up with being sidelined due to Haru's embarrassment.