The Unbreakable Vow

The Christmas Decorations at Hogwarts and Harry's Secret Detours
Hogwarts is fully decorated for Christmas with garlands, mistletoe, and enchanted candles. Harry Potter, familiar with the castle's secret passageways from his nighttime wanderings, manages to avoid the groups of girls attempting to catch him under the mistletoe. Ron Weasley finds Harry's detours amusing, laughing at the girls' attempts.
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Ron's Relationship with Lavender Causes Strain Between Friends
Ron Weasley enjoys his relationship with Lavender Brown but is defensive about Hermione Granger's feelings due to her past with Viktor Krum. Ron tries to justify his actions to Harry, mentioning he never promised Hermione anything. Harry remains quiet to maintain peace between his two best friends.
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Hermione Discusses Ron and Love Potions in the Library
Harry and Hermione Granger talk in the library, with Hermione claiming she doesn't care about Ron kissing Lavender. She also warns Harry that Romilda Vane and other girls are connectionting to give him love potions. Harry considers inviting someone to Slughorn's party to avoid such trouble.
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Hermione Explains How Weasleys' Love Potions Are Smuggled into Hogwarts
Hermione explains to Harry how Fred and George Weasley's love potions are smuggled into Hogwarts disguised as perfumes and cough potions, evading Filch's search efforts. She further suggests Harry invite someone to Slughorn's party to prevent further schemes.
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Irma Pince Confronts Harry About His Defiled Potion Book
Irma Pince accuses Harry of defiling his potion book when she finds him and Hermione in the library. After a tense exchange, Hermione drags Harry out of the library, joking about a possible romance between Filch and Irma Pince.
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Romilda Vane Tries to Give Harry Firewhisky-Laced Chocolates
After leaving the library, Romilda Vane offers Harry a box of chocolate cauldrons filled with firewhisky. Harry refuses, following Hermione's earlier warnings about love potions. Hermione gives him a knowing look before she leaves for the dormitory.
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Tension Between Ron and Hermione in Transfiguration Class
In Transfiguration, Hermione laughs at Ron's failed attempt to change his eyebrows, and Ron retaliates by mocking her enthusiastic behavior in class. This further strains their relationship, and Hermione leaves in tears, with Harry following to comfort her.
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Luna Comforts Hermione as Harry Invites Her to Slughorn's Party
Harry finds Hermione upset after leaving Transfiguration. Luna Lovegood comforts Hermione, and Harry seizes the opportunity to invite Luna to Slughorn's Christmas party. Luna happily accepts, and they prepare to attend the event as friends.
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Peeves Spreads Rumors About Harry and Luna Attending Slughorn's Party
Peeves overhears Harry inviting Luna to the party and spreads the news throughout Hogwarts, much to Harry's embarrassment. Ron Weasley expresses disbelief at Harry's choice of date, while Ginny Weasley defends Luna.
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Hermione Lies About Dating Cormac McLaggen to Get Back at Ron
At dinner, Hermione brags to Parvati Patil about going to Slughorn's party with Cormac McLaggen to make Ron jealous. Lavender Brown and Parvati gossip about Hermione's relationship choices. Harry silently observes the complicated dynamics between his friends.
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Harry Attends Slughorn's Party with Luna
Harry arrives at Slughorn's Christmas party with Luna Lovegood. Luna wears silver robes that attract giggles from other students, but Harry is glad she seems excited. As they head to the party, Luna talks about her father's bizarre theories, including one where Rufus Scrimgeour is a vampire. Harry finds her quirky nature amusing, and they proceed to the crowded and festive party.
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Harry Meets Sanguini the Vampire and Declines a Biography Offer
At the party, Slughorn introduces Harry to Eldred Worple, an author who wants to write Harry's biography. Worple is accompanied by Sanguini, a bored-looking vampire who seems more interested in the girls nearby. Harry declines the offer for a biography and excuses himself from the conversation.
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Hermione Regrets Bringing Cormac McLaggen to the Party
Hermione meets Harry at the party after escaping Cormac McLaggen under the mistletoe. She admits that she chose Cormac McLaggen to annoy Ron, but now regrets her decision as Cormac McLaggen is unpleasant company. The trio tries to avoid him as they move through the party.
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Professor Trelawney Complains About Sharing Classes with Firenze
Professor Trelawney, who is tipsy on sherry, complains to Luna about having to share her Divination classes with Firenze. Luna politely listens while Harry tries to navigate through the party without attracting more attention.
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Slughorn Praises Harry's Potions Skills, and Snape Joins the Conversation
Slughorn praises Harry's potion-making skills, much to Snape's annoyance. Slughorn credits Harry's success to natural ability, comparing him to his mother, Lily Potter. Snape remains cold and skeptical throughout the conversation, while Luna brings up the bizarre "Rotfang Conspiracy" theory, claiming that Aurors are trying to overthrow the Ministry.
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Draco Malfoy is Caught Sneaking into the Party
Argus Filch catches Draco Malfoy sneaking into Slughorn's party without an invitation. Though Filch is excited to punish Malfoy, Slughorn lets Draco stay, much to Harry's confusion. Harry notices that Draco looks pale and sickly, while Snape seems concerned but hides it quickly.
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Harry Follows Snape and Malfoy, Overhears Their Conversation
Harry uses his Invisibility Cloak to follow Snape and Draco, overhearing a tense conversation between them. Snape offers Draco his help, reminding him of the Unbreakable Vow he made to Narcissa Malfoy to protect Draco. Draco angrily refuses Snape's assistance, claiming he has a plan and doesn't need protection.
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Malfoy Denies Involvement in Katie Bell's Attack
In their conversation, Snape accuses Draco of being involved in Katie Bell's attack, but Draco vehemently denies it, claiming someone else must be behind it. Draco remains secretive about his plan, refusing to tell Snape anything, while Snape grows increasingly frustrated.
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