I don't like when the "kissing on the lips when asleep" trope is passed off as sweet, but this is a good celebration of Kuro's birthday anyway.
These two are in love, how the hell is it NOT sweet for her to give a tiny smooch when she's sleeping?
I'd assumed they weren't dating at the time or anything, which could have been a mistaken assumption, since the story doesn't provide any such context. Even assuming that they were dating, considering that this is their first real kiss, I'm skeptical that they would have known each other's physical boundaries beforehand or that Maya would have actually known what Claudine wanted when she was asleep. It's not like they had been kissing for ages when Maya did that.