It's sugary but you need to sort of turn off your brain or you'll get a bit disappointed and angry.
Author also tries to help the target audience but at the same time doesn't tackle the main problem for example premature ejaculation (PE) and how to beat it.
For example i think at some point every guy had something similar to PE. It isn't only a condition that needs to be cured it also depends on various factors. Primarily PE as a condition comes from over stimulated brain (You fucking think too much about the process and get overstimulated). Second is your physical condition, if you are undisciplined fat slob PE is your way of life.
Also various other factors might affect you for example abstinence, or getting aroused throughout the day and then finally getting to the point.
Also if you have PE and are too stupid or afraid to tackle it there are alternatives i.e. sex toys and your other body parts. A good lover can make his partner cum without pistoning action (and in reality many can't make their partners cum with only piston action, so it's advice not only for PE but for everyone, fucking doujin and porn created a problem for many young adults in that sector)
Next point which is getting to know a girl, i think a father figure or brutal inner voice should have told him get the grip wimp and take the lead and confess. Brooding over and getting ready to confess ( waiting for the right moment) isn't the correct way of doing it. While you wait the world will burnout, meaning while you are contemplating and waiting the person of interest might get away. (Respectively it an advice for both men and women). Like a guy waited for 1.5 years before he mustered to even approach her in that time some people can manage meeting someone, marrying and having a kid......
At the same time, it's also a story where the male lead, Sagami, is an obvious audience surrogate whose purpose is to guide how the audience should observe and react to the female lead, Musubu, who serves as eyecandy.
So with everything that i said, i think it's a bad guide for the audience. It doesn't guide it just works as fiction and entertainment, without much factual help to the audience.
And as for his "primal urges" I don't think he acted too slow when they started dating. In fact pacing was normal considering that she is older, socially awkward and with 0 experience herself. One thing is correct though and even harmful.
They create unreal expectations for skinny and pathetic guys i.e. meeting buxxon beauty....Like for real create someone plain or normal an average Japanese girl, help your fucking country increase fertility.