He laughs, in a genuine kind of way, obviously somehow relieved and also pleased with Sans's praise. Like a lot of kids, he obviously absorbs approval like a sponge.

"Yeah! That's why it's great! Because...sometimes my friends save me, and then sometimes I save them! I get saved from stuff all the time!"

The kitten climbing on his shoulder has ended up in his hair at this point, and lets out a 'mew'. He just lets it happen with breaking his stride, though it seems to remind him of something.

"Oh hey - do you like cats? If you do, you should hold one of these guys! Cats always make me feel better about stuff."