This involves boyxboy relationships and violence, if you don't feel comfortable, don't read it.
When harry is being bullied in Potions class he gets pushed into Draco causing the contents of the cauldron he was holding all over Draco. The potion reacts with something in the blonde's brain making it so it feels as if someone is casting the crucio spell on him if he tells even the whitest of lies.
The book is better than the prologue, trust meh!!