It wasn't a 'parenthood sticker', it was an indicator for the intention and mood for the specific moment.
It's nonsensical to brand the entire comic as weird only because you cannot differentiate moments from overall story. The characters are not sexually or romantically interested in one another at the time this had happened. And what happens later, when they are both adults, is unrelated to that moment entirely as the feelings develope, they are NOT immediately there simply because you as the viewer knows this will be a romance later on.
Again, cues for the moment and momentary mood/intentions are nothing to judge the overall story by. And this specific situation is not the only one. Take the classic trope of enemies to lovers for example. You wouldn't brand the entire relationship worthless and toxic just because that is how they started out. Same vice versa, for lovers turned enemies (both emotional and them actually wanting each other harmed).
oh…. so we’re going the grooming route?