Oh come onnnnn. He didn’t even blush ONCE. Only good outcome at this point with his… collarbone… fetish… is that whenever he sees one he either looks away and blushes a little or just stares intensely at it 😂
Yup. Collarbone makes sense... And it's indeed an advanced form of appreciating the female shape that simply doesn't occur to the pubescent T&A hordes. So MC did indeed skip puberty altogether in his training.
Quite a lot of fashion styles through the ages actually used this to full effect...
As well as manga drawing styles... Look at the bikini shots in the previous chapter, and notice what the mangaka actually did there...