A Not So Sudden Realisation

Probably Severitus, but could end up Mentor!Snape or Snape adopting Harry. Review with opinions? I'll continue if people are reading, but will abandon otherwise. First attempt at a HP fic. T for some abuse (not on Snapes part though) and a little bad language. Future Drarry is highly likely. EDIT apologies at excessive hiatus, have not been able to get to a computer.