First one I've ever actually seen of them KISSING.
As someone mentioned with the kink meme, there's not a lot of kink for this series (amusing, since JC liked tying both Yoite AND Miharu and dumping them in shady basements); or at least, I've not come across MxY doujin of the sort.
I think honestly, the relationship between the two of them is so sweet and tender, that people almost DON'T wanna kink it. I know I think all sorts of strange pairing kinks (yhalothar, Kuroshitsuji), but with this...
I never wanted to hit either of them; I just wanted to bundle them up in huge fluffy blankets, tuck them in by the fire, and feed them cookies and milk and just... I dunno, observe them or something!