The Marauders ( 9¾)

In 1971, at bustling platform 9¾, two special boys met, marking a fateful moment among the students eager to go to Hogwarts.On the Hogwarts Express.Severus Snape—thin, with greasy black hair and worn clothes—stood by the window, watching Lily Evans wave goodbye to her family. He smiled as she entered the train, chatting happily.However, before long, the compartment door slid open, and James Potter and Sirius Black stepped in.James Potter—his messy black hair sticking up in all directions, eyes gleaming with mischief—immediately drew attention. He carried himself with an effortless confidence, a half-smirk playing on his lips. Beside him, Sirius Black, with his aristocratic yet rebellious air, scanned the room with curiosity.
— "So, which house do you think you'll be in?" James asked, turning to Sirius.
— "Definitely not Slytherin," Sirius scoffed. "That house is full of unpleasant gits."

James Potter, Sirius Black and Severus Snape, Lily Evans, strangers to each other, meet at platform 9¾. They said nothing about each other until they entered one of the train compartments.