User blog comment:FairyRaven/Fairy Tail Chapter 331: Natsu's Strategy, Review and Commentary/@comment-112.205.79.141-20130517122559/@comment-4829046-20130517154147

I can't think of any Naruto/bleach/one piece/fairy tail-class action shounen where a Natsu-esque main character suddenly becomes all "relationship"-type. Almost all manga that have such developments have the "romance" label or have many subtle(well... not that subtle for the audience...) hints throughout the series eg: main male blushing and trying to cover up his embarrassment every time or main female always thinking about MC in her dreams(I could elaborate but the details vary depending on the age rating of the series lol) etc.