[It's clear that although he doesn't have much experience she more than makes up for it, which all things considered makes this so much easier to get through. Even pleasurable, which is a surprise in itself - he usually doesn't kiss strangers but right now he's finding himself helplessly lost.
It's a little like dancing (or so he thinks), with a strong enough partner it doesn't matter that you have two left feet and so he goes with it, following her lead in deepening the kiss, free hand tentatively landing somewhere near her waist. ]