The Moirai and the Lair of Death and Vipers (слэш)

‘“You can’t go alone Harry,” Hermione said, trying to lift herself to her feet but giving up with a squeak, “You need help!”
“No,” Harry said firmly, “This is my decision to run off to try and save Sirius, no one else’s - and you need help Hermione! Look at your ankle!”
“How are you even getting there?” Ron demanded, “Cause’ if you want to floo, it looks like we both need to go back up to the castle,” he cried triumphantly.
The answer to his question came in the form of a sudden insistent tugging at the sleeve of Harry’s robe. He flinched back, and looked down to find the skeletal head of doe-eyed Thestral following the path of his hand in an attempt to lick off the blood that coated his arm. Harry froze for a minute, then grinned. He knew exactly how he was getting to London.’
—
When Harry made the choice to leave his friends behind, and rescue Sirius from the Department of Mysteries on his own, he had never imagined what the consequences might be.
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Non-con elements are predominantly in the beginning and are none graphic