Oooh, this is smokin'! I love the juxtaposition of the darkness of Knockturn with the grittiness of the sex. I love that they still think of each other as greasy and horrible and beastly and enemies... oooh, yeah! And oh, oh, Remus holding Snape's head in to swallow??? *whimper* And the differences between 'Snivellus' and 'Severus' and Remus's head made me shiver. Nice job!