Great opening sequence; you sucked me in right away.
I love that the experience went both ways here, so that, through these moments of (not entirely voluntary) vulnerability, Severus and Remus finally begin to really see and feel compassion for each other. Or at least, Remus' (unexpected) compassion and vulnerability melts Severus in the end.
Although neither openly confesses anything, so much of their usual reserve is stripped away by the circumstances that they can't hide much of anything. The potential for this sort of unspoken understanding between the two of them is what makes this pairing so fantastic. And the sex... out of control Remus... intensely passionate Snape... guh!! Well done.