Ooohhhh scary! Snape is sickly pleased. I LOVE his full robes still on, but parting and Remus' bare legs on either side. That's all kinds of sexy. Remus' position is actually quite fascinating. I like how his body seems to be enjoying what Snape is doing, and his expression could easily be one of protest or one if bliss. I can't figure out his emotions, but I love staring at this and trying to decide. I keep making up scenarios in my head; very inspiration for my muses.
But poor Remus *wants someone to ride in and rescue him*