But one place that comes to mind that he most definitely must/should/would/could have is in the Ark after he's been calling out for Allen, then decides that Kanda might be alive too if he is, and calls out for his Yuu-chan...who appears, and then Lavi pretty much goes all squealy-thrilled to see him and runs over to him pretty much with open-arms ready to glomp (and kiss, definitely
)