Bonus points if someone can rec me kissing in a Snape/Black fic that's plausible.

??????
Sod plausible and read this (http://www.tittisrealm.com/thinline/fabula/repechage.html) instead.

P.S. As for kissing in Snape/Black stories, I see it so: they can fuck each other as thorough as they want, but once they start kissing they are lost. And that is the main premisse of Snack in general.