I don't remember whether J2 were in high school or not. But I remember that when Jensen was a kid he witnessed his parents be homophobic towards some group of people. They were homophobic in general as well. This is why later on Jensen is afraid to tell his parents his sexuality. But as the fic goes on, it turns out that his parents actually changed their beliefs and are now OK with gays. Rings any bells?

Unfortunately this is all I remember :( I don't even remeber whether the fic was AU or NonAU.