Disclaimer: I do not own any of the characters or the Harry Potter franchise.
Goyle and Parvati were in love. They told secret stories to each other under the womping willow about Horcruxes and wands. One day, when Parvati got lost in the restricted section of the library, she stumbled upon a box of Friddledaddles. Not knowing what they were, she cast Alohomora to open the box and then avada kadavra to kill them. Little did she know, that if a wizard or witch does that, they grow bigger and bigger until they burst, spreading lies and deceit through the wizarding community.
Parvati's sister, Padma felt a cold breeze gushing through her heart, when the explosion occurred. She gasped and grabbed her wand, ready to defend herself for she did not know what could possibly penetrate her cold icy exterior. She started casting expecto patronum at random, the air around her, hoping to stun the invisible intruder who was not there. And never was.
Goyle heard Parvati's yelps for help while in Hogsmead. He apparated back to the library to protect his loved one. But it was too late… she had disappeared into thin air. Draco cried 'No!!!! You guys were getting so close!!!' Mr. Flitwick left the charms class to the defence of his student, but she was already gone.
Hermione was outside in the Forbidden Forest, plucking biddleberries for her Wingardium Leviosa potion, when Goyle apparated near her. "Please Hermione, can you help me go back in time?" "No. Cos remember that time you tripped me at nineandthreequarters? I fell flat on my face. I haven't forgiven you!' 'Please!'said Goyle. 'Why not let him, Hermione' said Victor Krum. 'Oh all right. Yes Goyle take hold of my clock from the prisoner of Azkaban that I got from Mrs. Magonnagle. But be careful! It might make you tired!' Goyle grabbed it and put it in his robe pocket, next to his Monster book of monsters. He went back in time to when his beloved Parvati went to the restricted section. She was just about to reach for the book written by The Half Blood Prince when he embraced her with his big arms. 'What you doing here Goyle?' 'I am your rescuer. You shouldn't break those Friddledaddles or the whole world will collapse and even Potter can't save us'. 'Thank you my darling' 'Avada Kadavra' 'Nooooo!!!!!!!' 'I only pretended I loved you!'… The screams were heard all the way in Bourkem and Burges.