[ He too parts his mouth and let's the intruding tongue find his own. They have done this a couple of times before so he isn't entirely clueless about what should he do, yet, although being kissed like this still feels odd and even a bit embarrassing, he lets his tongue run along the other, pressing and touching just to see what kind of reactions he'll get in return.
He's determined to find out how to make this kind of kissing enjoyable for both of them so that kissing happens more often. ]