Why is everyone in this damn forum assuming every teenager is some sort of brainless horndog? I started reading 18+ yuri when I was 11, but I didn't develop a sex drive until I was like 20. That's right. My entire puberty was bereft of horny. It's not that abnormal to have a low sex drive even if you're legitimately in love with someone, and for ace people it is indeed a task that requires effort to have sex at all generally.
This is, again, a problem of compatibility, and it's kind of amusing seeing these dumb kids in the manga completely miss this concept over and over.