Harry Potter And The Blood's Curse

A smarter Harry as a result of an OC being introduced. Starts from year 1 and should work through all years eventually. Mostly the book universe, with some tweaks where I feel it's logical. Undecided pairings, but probably HP/HG and OC/DG and NL/LL but thats open to change. M is for violence and to protect myself so that I have more room to write how I feel the universe would work.