Chapter 1--Betrayal
"Alright," Harry Potter whimpered, lying flat on the ground literally two inches from Lord Voldemort. "I give in. I'll join your Death Eaters."
"Good boy," whispered Lord Voldemort, taking in the joy of the moment. "I'm glad of your decision, and am going to let you go home now. But first--" He grabbed Harry's arm and shouted, "Nexo Pannosa!" A few seconds later, a black skull and a snake was burnt onto Harry's arm, wriggling around to show he was in Voldemort's presence.
The Dark Lord let out a cold laugh, and some of his older Death Eaters joined in with him. That was, untill he sent a death glare around at them, and they all were silenced.
"You may go now, Potter," Voldemort hissed, lowering his wand from Harry's arm. "But you know what to do if that mark of yours starts burning."
"Y-yes, M-master," stammered Harry as he apparated back to Number Twelve Grimmauld Place. As soon as he arrived, he sank into an old sofa in the living room.
"What have I done?" He whispered to himself, burying his head in his hands, and noticing that his new Dark Mark was still burning a little bit. "I'm supposed to defeat Voldemort, not join him. Sirius is gonna kill me."
Then, suddenly, Harry realized something. He would never be able to even just talk to any of his friends or family anymore. Especially Sirius and Hermione. Hermione was a muggle-born, and Sirius was a Black who betrayed his family. Now that he thought about it, he wouldn't be able to talk to anyone anymore. Everyone was in the Order of the Phoenix, or was a blood-traitor.