Eh, could just be cheek to cheek.

But what I do know for sure, that lock of curly hair is super intentional.

I really don't like the idea of them kissing, and no not because I'm "homophobic" or anything (I'm not, for the record) but because that would make this fusion, and the episode, a shit ton sadder.
The episode is about Greg thinking that he's not good enough for Rose, with him straight-up asking if he's good enough for her, if she respects him and she just laughed right in his face. This was Greg wondering if he was just a novelty, and as Pearl put it, a "phase".