Call me a freak (слэш)

This was mostly written because I wanted to write something smutty with not a whole lot of plot. Harry is not underage in this story, the relationship first begins when he is 18 when he returns to school to complete his last year after defeating voldemort. But it progresses past Harry being in school as well.
I knew that I was a freak the first time James Potter humiliated me in front of the girl I thought I loved… and I got an erection.
Other warnings: This is unbetaed and I only skimmed over it looking for grammer issues and/or misspelled words. So I'm sure there are at least a few. Please look at the tags.