Yeaaaah, this kiss might've taken longer than some others... but those were almost always ACCIDENTAL, and were still followed by ages of denials about their feelings.
@Liquidxlax You've never read Quintessential Quintuplets, Love is War, or We Never Learn I guess, or almost any other romcom manga. 70 chapters is nothing and most end at the confession/kiss
Having a romance thing reveal the love parts this early shouldn't be a specialty, it should be the norm. Even if they get married. Marriage is only half the journey. Anyone that says otherwise probably sucks at marriage.