Severus Snape decided to join Voldemort after meeting him in the summer before his seventh year.

Brief meeting between Dumbledore and Voldemort.

Ron is visiting the Mirror of Erised again and Dumbledore has to give another advice.

Dumbledore after the events in Chamber of Secrets.

Why did Severus finally decided to join Lord Voldemort?

Another chance for Dumbledore and Riddle. Thoughtful Dumbledore, sane Riddle, confused Harry, evil Voldemort. Armed with future knowledge, but unable do directly intervene, Dumbledore and Riddle try to prepare Harry for incoming conflict and maybe even finally understand each other. Fourth year AU

Just a little bit different chat with Sirius and Remus

Ron took rejection from Fleur very hard and decided to become a better version of himself. Naturally, he took his best friend with him.

Dumbledore found out about Umbridge's detentions and reacted. Harry PoV

After the war, Lucius Malfoy travelled back in time and decided to tell Dumbledore everything. But with one condition - in exchange for his help, Dumbledore will have to tell him the secrets behind his power. Story focused on explaining Dumbledore's decisions based on his magical knowledge.

He promised to tell him everything. Dumbledore mentor story. Sixth year.