the_debt_of_time

The memory flashed and suddenly he saw the white walls of St Mungo's. "She's dead?
My mum's dead!?"
Remus blinked rapidly and let out the breath he was holding before turning his eyes
up and glaring at the dementor. "No one here is hiding Sirius Black! Leave!"
From the corner of his eye, he watched as Harry collapsed to the ground in a
faint. Fuck, Remus inwardly cursed and then held his wand out as the dementor turned its
attention to the boy. Remus closed his eyes and thought of the river behind Potter Manor,
a fake full moon in the Room of Requirement, Lily and James's wedding, and holding a
newborn Harry Potter in his arms.
"Expecto Patronum!"
A silvery wolf emerged from his wand, bared its teeth at the dementor, and then
literally chased it out of the compartment doorway.
Once the creature was out of sight, Remus lowered his wand and knelt down beside
Harry, slapping him lightly on the cheeks. "Harry? Are you all right?" He watched as the
boy opened his eyes. In the dim light of the relit lanterns above them, an emerald colour
reflected back. Remus took a breath. Lily's eyes.
"W-What?"
"Are you okay?" Ron asked nervously.
"Yeah," Harry answered, looking quickly toward the door. "What happened?
Where's that thing? Who screamed?"
Remus frowned at the boy's words. He knew that dementors had the ability to make
one relive their worst memories. While he experienced the horror of hearing his mother's
screams as Greyback bit into him, followed up by the memory of her death, he could only
imagine what Harry had seen and heard.
"No one screamed," Ron replied.
"But I heard screaming."
Remus reached into his pocket and removed the large bar of chocolate he had been
saving for later when the worst of his symptoms would surface thanks to the full moon.
By the look on Harry's face, he needed it more.
"Here," he said to Harry, handing him a particularly large piece. "Eat it. It'll help."
"What was that thing?" Harry asked.