the_debt_of_time

When she thrust down particularly hard, Sirius winced and gripped her hips tight in
his hand, clenching his teeth and breathing hot against her sternum.
Mia looked down as his body quaked beneath her. "You're holding back."
Sirius swallowed and exhaled slowly, trying not to pass out. "I... I'm not."
Nineteen years, and he's still a rubbish liar, she thought as she pulled his head away from
her chest to look in his eyes, which were so dilated she could see only a thin line of silver
around the black pupils.
"Don't lie to me, Sirius. You're shaking, and it sure as hell isn't because of nerves,"
she said, watching as his eyes flashed and his jaw tightened. "I know what you're doing.
Remus used to act the same way, only he was trying to hold back a werewolf. What're you
trying not to unleash?"
He took a moment and then frowned. "Me."
"I want you."
Sirius shook his head. "I'm different," he said, his body still shaking. "I'm changed.
I'm broken and damaged and dark and I―"
"Sirius," Mia whispered lovingly, reverently. "The first time you saw me, I was an
eleven-year-old girl with a skinned knee in Diagon Alley. I was your best friend's sister,
who bought you Cauldron Cakes and played with your hair." She threaded her fingers
through the thick strands, and he tilted his head into her touch. "The first
time I saw you... was in the Shrieking Shack when I was fourteen. I knew what you'd been
through in Azkaban. I saw your scars and your... your sanity."
Sirius scoffed. "Or lack thereof."
Mia did not correct him, but she did continue speaking. "I watched you break Ron's
leg, kick Kreacher, pin Mundungus Fletcher to the ground, and argue non-stop with Snape
and Molly. You were unstable and violent and reckless, and I still brought you back from
the veil. Then I watched you kill Death Eaters to protect Harry and me." She ran the pad
of her thumb over his bottom lip and smiled when he caught it between his teeth.
"You ripped out the throat of Bellatrix Lestrange for hurting me," she reminded
him, noting the growl that escaped his throat, vibrating against the thumb still caught in
his mouth. "I saw you in prison robes long before I ever saw you in a Hogwarts tie. I saw
you blood-soaked and furious long before I ever saw you innocent and young."