Wow! OMG, that is hot as fire, and I generally have no interest at all in BDSM. This is so entirely different from other fics I've read. I absolutely adore the way you have developed the two and kept their personalities true. Snape is not a nice man, and Harry likes him that way. That's my favorite Snarry scenery. And the kiss and the contract just hint that this could become a deeper relationship. Have I mentioned how hot this is?