The Weakness

23

Thor landed on an island in the center of a crystal blue lake. A girl dressed in blue and silver armor and black leather pants stood from her bench and walked over to Thor.
"How did you find me?" She asked.
"You leave certain traces, sister." Thor said, gesturing to a faint trail of ice in the water.
"Oh yes. That little...inconvenience." She muttered. "What do you want?"
"Erin, Loki is in the custody of humans and he cannot be let out until he tells them where the tesseract is." Thor said. The girl sighed and clasped her hands behind her back, muttering "Stupid SHIELD." Her black hair was unruly, reaching her mid-back.
Erin's icy grey eyes met Thor's blue ones. "You realize what you are asking of me, brother." She said quietly. Thor tapped his hammer against his thigh.
"Yes. I do." He murmured. Erin stepped toward him.
"I cannot betray Loki. That is why Father ordered me to stay away. I have spent time away from him on Odin's orders. Loki and I cannot be on the same side, no matter how much I long to be. That's why I am controlling my powers. I do not want to cause any more damage." She said quietly.
"I know. Come, let us save our brother." Thor said, holding out an arm to Erin. She was hesitant at first to touch him.
Thor smiled. "Do not worry. You are the goddess of control, are you not?" He said. Erin nodded and slipped her hand around his arm.
Thor swung his hammer and they flew off towards the airship. Erin let go of his arm as they landed. Nick Fury and Maria Hill came up to them and Erin willed herself not to step back.
"This is her?" Fury asked. Thor nodded. "We've met." Fury murmured.
"She is my sister. Remember your vow." Thor warned. Erin winced.
"Come with me." Fury said.
Erin followed Fury and Hill into the ship. They led her to a room a corridor away from Loki's cell, although she did not know it.
"What do you want me to-" Erin stopped short as the door shut behind her. She turned and tried the handle, but it was locked. Her hands clenched as she heard a crackling of static and then a voice.
"Sorry, but you're the only thing that Loki relatively cares about." Fury's voice said. Erin paled and backed against the wall.
"You wouldn't-" She was interrupted by a splitting pain in her side. She looked around wildly, but didn't see anything.
Suddenly, there was a flash and Erin fell to the ground, clutching her head. A searing pain broke through her mind and she screamed.