Imprisoned (Ereri/Riren AU)

Eren Jaeger woke to the feeling of pain. He felt as if someone had injected acid into his veins, and pressure on his ankles and wrists made him grimace as he tried to lift his hands to his head. His eyes flew open in confusion as he heard the clanking of chains, and he squinted at the bright light flooding his vision. As his eyes adjusted, he looked at his wrists, which were bound in thick metal shackles. Suddenly, the events of the night before crashed through his mind like a tsunami, and terror took over. He cried out a hoarse "Mother!" Before a cold, unaffected voice spoke directly behind him.
"Quiet, brat, or I'll have to punish you again."
Eren Jaeger is a 16 year old boy, living in a small village on a remote island in the Indian Ocean. He has just been captured by slave traders, as has what is left of the village. Nearly half of his tribe was wiped out when the traders attacked, including his mother. One of his captors, a man whom is only known by the prisoners as "The Corporal," has made him his personal dog, his own slave. His only wish is to find the man that killed his mother, and wipe his entire being from this world.