Chapter 14 - "Felix Felicis" - In which Hermione and Ron discuss the Slug Club in Herbology and Harry notices an attraction between them, Dean takes Katie's place on the Quidditch team, and Harry and Ron run into Ginny and Dean kissing. Ron gets upset and Ginny tells him off, but Harry starts thinking of kissing Ginny himself. Ron becomes angry and plays terribly next practice, but for the match Harry pretends to slip him Felix Felicis, giving him confidence, and Gryffindor wins. After the game, Ron is spotted kissing Lavender, leaving Hermione upset.
Harry's Second Lesson With Dumbledore
As Harry and [Dumbledore] watch in the Pensieve, a much younger [Albus Dumbledore] visits Tom Riddle's [orphanage], meets [Mrs. Cole], and makes arrangements with her for Tom Riddle to begin attending Hogwarts, though she descriptions of Riddle are somewhat disturbing.
In the Pensieve, a younger [Dumbledore] has his first meeting with young Tom Riddle in his [orphanage], where he tells Riddle about Hogwarts, hears Riddle's descriptions of his use of magic, and forces him to return the possessions he's stolen.
In Herbology class, Harry tells Ron and Hermione about his second lesson with [Dumbledore], and Hermione describes the previous night's Slug Club party. When Ron gets upset, she admits she was planning to invite him to Slughorn's Christmas party, and Harry notices a change in his friends' behavior.