"Well, if you had to realize kissing me was good, that does imply-" Oh, look, kissing's actually a relatively effective method of shutting the smaller boy up. And Herbert doesn't fight the kiss, for all that he's been protesting - he kisses back the same way he didn't before, with that single-minded urge to show his roommate up, which, coincidentally, happens to be excellent for responding to Tony's desire to make out.