This manga, like countless others like it, is aimed specifically at people who went through middle school (and high school, and college) without any relationship experience whatsoever.
Figured that out by first chapter. Because I was questioning why the art style and MC's looked soo familiar. Turns out they do kind of look like Cecilia and Lawrence! 👀
Why do these stories always have to take so long to actually have the relationship??? They like each other and he has no actual reason to reject her..... and the parents seem to obviously approve...