I want the part of the warnings where you say "eventual OOC" to be quite wrong. I want it to be rapid, early onset of OOC, for both Snape and Harry.
However, you make it so convincing that I'm not sure either one really goes OOC. From a Harry who could use a Crucio in DH where a Petrificus would do, who's to say what is OOC?
Thank you for investigating this dark side of Snarry so adroitly, so unromantically, so vividly and well. Or maybe not... :-) *shivers*