[ Later, he might wonder if he was being cruel in not answering her back with a full fledged "I love you (too)" right back, if giving the sort of "of course" reply was too flippant for what is sort of the first time saying it. Right now, though, he considers it a worthwhile answer in the afterglow. And it's perhaps because of that certainty that he snorts into her chest and quips back, ]
Hey it still works out we can have little fun, no need to apologize to me
Low standards.
[ He could do a lot better.
... And much too short ]